Imágenes de páginas





tervals in music, as the major third, major the microscope. The species consist of which have not more than two pits or fossa sixth, and major seventh.

single free cells, or the cells remain attached on the head. Diastase (di'as-tās), n. (See DIASTASIS) so as to form linear, flabelliform, circular, Dibranchiata (di-brangk-i-a'ta), n. pl. [Gr. A substance existing in barley, oats, and or geniculate fronds, or in some cases the prefix di, and branchia, gills.] An order of potatoes, but only after gerinination, and cells or frustules are inclosed in a trans cephalopods in which the branchiæ are two so called because when in solution it pos parent gelatinous sheath or frond. The in number, one situated on each side of the sesses the property of causing fecula or ordinary method of increase is by cell divi body. The group is divided into two tribes, starch to break up at the temperature of sion. Reproduction by conjugation has been the decapods and the octopods. 150 Fahr., transforming it first into dextrine observed in several of the genera. Diatomia- Dibranchiate (di-brangʻki-át), n. A memand then into sugar. It is obtained by ceæ are found fossil, forming considerable ber of the Dibranchiata. digesting in a mixture of three parts of deposits of tertiary age, as at Bilin, Rich Dibranchiate (di-brang'ki-āt), a. Having water and one of alcohol, at a temperature mond in the United States, &c. Fossil two gills; as, the dibranchiate molluscs. of 113° Fahr., a certain quantity of germin polishing powders, as tripoli and berg-mehl, Dibstone (dib'ston), n. A little stone or bone ated barley ground and dried in the open are composed of them. They are abundant which children use in a certain game. See air, and then putting the whole under pres. in guano.

DIB. sure and filtering it. Diastase is solid, white, Diatomic (di-a-tom'ik), a. [Gr. di for dis, Dicacioust (di-kā'shus), a. Talkative; saucy. and soluble in water and diluted alcohol, twice, and atomos, an atom (which see) 1 Dicacity (di-kas'i-ti), n. [L. dicacitas, railbut insoluble in strong alcohol.

In chem. consisting of two atoms; as, a lery, from dicax, dicacis, talkative, witty, Diastasis (di-as'ta-sis), n. (Gr. diastasis, a diatomic radicle.

from dico, to say.)

Pertness. (Rare or separation-dia, asunder, and sta, root of They (alcohols) are divided into monatomic, dia. obsolete.) histēmi, to stand.) A forcible separation of tomic, and triatomic alcohols, according as they are

This gave a sort of petulant dicacity to his rebones without fracture. built upon the type of one, two, or three molecules of



Rodwell. Diastem (di'a-stem), n. (Gr. diastēma, dis

Dicæology (di-sē-ol'o-ji), n. [Gr. dikaios,

[Gr. dia, tance. See DIASTASIS.] În music, a simple Diatomous (di-at'om-us), a. interval. through, and tonné, a cutting, from temno, to

just, and logos, discourse.) In rhet a figure

of speech in which the orator attempts to Diastema (di-a-stē'ma), n. [Gr., distance,

cleave.) In mineral. having crystals with

move the audience in his favour. interval.) În zool. the term applied to the

one distinct diagonal cleavage.

Dicarbonate (di-kärbon-āt), n. In chem. interval between any series or kinds of Diatonic (di-a-ton'ik), a. (Gr. dia, by or

a term sometimes applied to a carbonate teeth; thus man is notable as having no through, and tonos, sound.] 1. In Greek

containing one atom of carbonic acid with diastema, his teeth forming a continuous music, a term applied to one of the three

two of the element with which it is comseries. genera of music, the other two being the

pounded. chromatic and the enharmonic.--2. In modDiastole (di-as'tó-lē or di'a-stol), n. (Gr.

Dicast (di'kast), n. (Gr. dikastēs, from diastolē, a drawing asunder, from diastello ern music, applied to the major or minor

dikaző, to judge, from dike, justice. ) In --dia, and stello, to set, or send from.] 1. In scales, or to chords, intervals, and melodic

Greek antiq. an officer answering nearly to med. a dilatation of the heart, auricles, and

progressions belonging to one key - scale. arteries: opposed to systole, or contraction. A diatonic chord is a chord having no note Dicastery (di-kas'tėr-i), n. In Greek antiq. a

the modern juryman. 2. In gram, the extension of a syllable, or

chromatically altered. A diatonic interral
is an interval formed by two notes of the

court of justice in which dicasts used to sit. a figure by which a syllable naturally short

Dice (dis), n. pl. of die; also a game with diatonic scale unaltered by accidentals. A is made long diatonic melody is a melody composed of

dice. See DIE, a small cube. Diastolic (di-a-stol’ik), a. Pertaining to or

Dice (dis), v.i. To play with dice. notes belonging to one scale only. A diaproduced by the diastole.

1... diced not above seven times a week. Shak. tonic modulation is a transposition by which The other of the two sounds coincides with the one key is changed into another closely re

Dice (dis), v.t. pret. & pp. diced; ppr. dicing. diastole, and is spoken of as the second or the dias

1. To sew a kind of waved pattern near the lated to it, as G is to C, D to A, and so on. tolic sound,

Diatonically (di-a-ton'ik-al-li), adv.

In a

border of a garment.--2. To weave in or Diastyle (di'a-stil), n. (Gr. diastylion, the diatonic manner.

ornament with square or diamond-shaped space between columns--dia, and stylos, a Diatribe (di'a-trīb), n. (Gr. diatribē, a wear

figures. column.) In arch. that mode of arranging

ing away, a loss of time--dia, through, Dice-box (dis'boks), n. A box from which columns in which three diameters of the and tribo, to rub.) A continued discourse

dice are thrown in gaming. columns are allowed for intercolumniations.

or disputation; a strain of invective; abuse; Dice-coal (dis’kol), n. A species of coal Diatessaron (di-a-tes'sa-ron), n. [Gr. dia,

reviling Her continued diatribe against

easily splitting into cubical fragments. and tessara, four.] 1. In ancient music, a

intellectual people.' M. C. Clarke.

Dicephalous (di-sef'al-us), a. (Gr. prefix concord or harmonic interval, composed of Diatribist (di'a-trib-ist), n. One who pro

di, and kephalë, head.] Having two heads a greater tone, a lesser tone, and one greater longs his discourse or discussion; the author on one body semitone. Its proportion is as four to three, of a diatribe; one who makes diatribes.

Dicer (dis'ér), n. A player at dice. and it is called a perfect fourth.-2. A har- Diazeutic, Diazeuctic (di-a-zūt'ik, di-a

false as dicers' oaths.' Shak. mony of the four Gospels; the four Gospels. zūk'tik), a. [Gr. diazeugnumi, to disjoin- Dich (lik), v.i. [Probably corrupted from Diathermal, Diathermanous (di-a-ther'. dia, priv., and zeugnumi, to join.) Disjoin

d'it, for do it.] Do it; may it do. Much mal, di-a-thér'man-us), a. (Gr. dia, and ing --Diazeutic tone, in ancient music, a

good dich thy good heart.' 'Shak. [* It has thermaino, to heat.) Freely permeable by tone which, like that from F to G in modern

not been met with elsewhere, nor is it known heat. The term is specifically applied to music, lay between two tetrachords.

to be provincial.' Narex. ) certain substances, such as transparent Dib (dib), v.i. In angling, to dip or dibble.

Dichastasis (di-kas'ta-sis), n. [Gr., from pieces of rock-salt, &c., which suffer radiant Dib (dib), n. A dub; a pool. [Scotch.)

dichaző, to disuvite-dicha, in two, from heat to pass through them, much in the

The dibs were full; the roads foul. Galt.

dis.) Spontaneous subdivision. same way as transparent or diaphanous dib (dib), n. 1. A small bone in the knee of

Dichastic (di-kast'ik), a. Capable of subbodies allow of the passage of light.

dividing spontaneously. (Rare.) Diathermancy, Diathermaneity (di-a

a sheep, uniting the bones above and below Diche,tv.t. To dig; to surround with a ditch. therman-si, di-a-therman-ẻoi-ti), m. The

the joint. [Provincial.] - 2. pl. A child's Chaucer. property of transmitting radiant heat; the

game, consisting in throwing up the small Dichlamydeous (di-kla-mid'é-us), a. (Gr.

bones of the legs of sheep, or small stones, quality of being diathermal.

prefix di, and chlamys, a garment.] In bot. Diathermanism (di-a-thér' man-izm), n.

and catching them first on the palm and then

having two coverings, a calyx and a corolla. The doctrine or phenomena of the transon the back of the hand; in Scotland called

Dichobune (di-ko-būn'), n. (Gr. dicha, mission of radiant heat.

Chuckies, and played with pebbles.-3. pl. A divided in two, and bounos, a ridge.) A Diathermanous, a. See DIATHERMAL. slang name for money; as, down with the

genus of extinct quadrupeds, occurring in Diathermic, Diathermous (di-a-thér'mik, dibs. Make nunky surrender his dibs.' Re

the eocene formations, presenting marked di-a-thér'mus), a. Diathermal jected Addresses

affinity to the ruminants, and coming beDiathesis (di-ath'ê-sis), n. (Gr.] In med. Dib, Div (dib, div). (Hind., island.) The

tween them and the Anoplotherium. The particular disposition or habit of body, good final element of many Hindu place-names;

name is derived from the deeply cleft ridges or bad; predisposition to certain diseases as, Serendib, Ceylon; Maldires; Laccadives.

of the upper molars. rather than to others. Dibber (dib'bér), n. (See DIBBLE.]

Dichodon (disko-don), n. [Gr. dicha, in two Diatom (di'a-tom), n. A member of the A dibble; an agricultural instru

parts, and odour, odontos, a tooth. A genus Diatomaceæ (which see). ment having dibbles or teeth for

of extinct quadrupeds, closely allied to the Diatoma (di-ató-ma), n. [Gr. dia, through, making holes in the ground.

Dichobune, whose remains occur in the and tome, a cutting.) In bot. a genus of Dibble (dib'bl), n. [Like dibber,

eocene of Hampshire: so called from the from dib, a form of dip.] A point

double crescent-shaped lines of enamel on ed instrument used in gardening

the upper surface of their true molars. and agriculture to make holes for

Dichogamous (di-kogʻa-mus), a. In bot. explanting seeds, bulbs, &c.

hibiting or characterized by dichogamy. Dibble (dib'bl), v. t. pret. & pp.


Dichogamy (di-kogʻa-mi), n. (Gr. dicha, in

dibbled; ppr. dibbling. To plant
with a dibble, or make holes in for plant-

two parts, and gamos, marriage.) In bot, a

provision in hermaphrodite flowers to preDiatomaceæ, of which the frustules are coning seeds, &c.; to make holes or indenta

vent self-fertilization, as where the stamens nected together by their angles, forming a tions in, as if with a dibble.

and pistils within the same flower are not zigzag chain.

The clayey soil around it was dibbled thick at the matured at the same time.
Diatomaceæ (di'at-o-mā"se-e), n.

H. Miller.
In bot.
time by the tiny hoofs of sheep.

Dichotomistt (di-koto-mist), n. One who a natural order of confervoid algæ, consist- Dibble (dib'bl), v.i. To dip, as in angling. dichotomizes, or divides things into pairs. ing of microscopic plants found in fresh, This stone fly, then, we dape or dibble with, as Bacon. brackish, and salt water, and on moist plants

with the drake.

1. Walton. Dichotomize (di-kot'om-iz), v.t. [See Diand damp ground. The frond secretes a Dibbler (dib'blér), n. One who or that which CHOTOMOUS.] To cut into two parts; to very large quantity of silex, which is formed makes holes in the ground to receive seed; divide into pairs. in each cell into three portions, viz., two a dibble.

Dichotomous (di-kot'om-us), a. (Gr. dicha, generally symmetrical valves and the con Dibothrian (di-both'ri-an), n. (Gr. prefix doubly, by pairs, and temió, to cut.] In necting hoop. The valves are very various di, and bothrion, a pit.] A member of a bot. regularly dividing by pairs from top to in forms, and covered with beautiful sculp division of the Entozoa, including those bottom; as, a dichotomous stem. A good turings, so as to form exquisite objects for tape-worms of the family Bothriocephala example of a dichotomous stem is furnished





DICTION by the mistletoe.- Dichotonous corynbed, criser, wla sat, of course, in his own particular lttle Dicta See DICTUM. composed of corymbs, in which the pedicles

diskoy at the side.


Dictament (dik-tá men), n. A dictation; divide and sulkivide by pairs.

On the ducky before is seated a heap < greatcoats,

a precept; an injunction. Lord Falkland. Dichotomously (di-kot'om-us-li), ado. In with a straw hat co the top of them, wiile tre runde Dictamnus (dik - tamn'ms) n. (A name a dichotomons manner.

behind extitats a male and female shrouding them. adopted from Virgil, from Dicte, a mounDichotomy (di-kot'om-i), n. (Gr.dichotomia, seises under the coverture of the sanie cock

tain in Crete, where the plant abounds)

The Kaprake, 1829. a division into two parts--dicha, and tenni,

In bot. (a) a small genus of plants found in to cut.) 1.1 A cutting in two; division 4. An ass, male or female.

southern Europe, Asia Minor, &c., nat. order “A general breach or dichotomy with th Dicksonia (dik-so'ni-a), n. [From James Rutaceæ. D. Frasinella and D. albus are church' Sir T. Broune.-2 In logic, division Dickson, a Scotch botanist.) A genus of both cultivated in gardens for their fraor distribution of ideas by pairs; especially, tree-ferns with large much-livided fronds, grant leaves. See FRAXINELLA (6) The the division of a class into two sub-classes and the spores inclosed in a coriaceous two dittany of Crete. See DITTANY. opposed to each other by contradiction; as, valved indusium. D. antarctica is a great Dictate (dik'tát), t.t. pret. & pp. dictated; the division of the class man into white ornament in our greenhouses, and is also ppr. dictating. (L dicto, dictatum, a freq. and not white

employed as a bedding plant. It is a native of dico, dictum, to say.) 1 To tell with 3. In astron. that

authority; to deliver, as an order, comphase of the moon

Dicky-bird (dik'i-bérd), n. 1. A pet name mand, or direction; as, what God has diein which it apfor a little birl 2. A louse.

| tated, it is our duty to believe.-2. To order pears biserted or

Diclesium (di-klē'si-um), i. In bot. a small or instruct what is to be said or written; to shows only half

dry indehiscent pericarp, having the indu utter, so that another may write out; as, a its disk, as at the

rated perianth adherent to the carpel, and general dictates orders to his troops; a merquadratures. -- 4.

forming part of the shell, as in the marvel chant dictates letters to his clerk. "The mind In bot. a term of Peru

which dictated the Iliad' Wayland. --3. To employed to ex

Diclinic, Diclinate (di-klin'ik, diklin-át), a. suggest; to admonish; to direct by impulse press & mode of

(Gr. prefix di for dis, twice, and klino, to in on the mind; to instigate; thus we say, the branching by con

cline ) In crystal, an epithet applied to Spirit of God dictated the messages of the stant forking, as

crystals, in which two of the axes are ob- prophets to Israel; conscience often dictates when the first

liquely inclined, as in the oblique rectangu io men the rules by which they are to stem or vein of a lar prism

govern their conduct." plant divides into Infiorescence of Valerianella Diclinous (diklin-us), a. (Gr. prefix di, two Reason will dictate unto me what is for my good branches, dentata, showing the Dichofold, and klino, a bell.] In bot a term ap

and benefit.

State Triais. each branch into tomous Branching

plied to a plant which has the stamens in Sex. To suggest, prescribe, command, entwo others, and so

one flower and the pistil in another, as in join, point out, admonish. on. This is seen in the veins of fern leaves the oak.

Dictate (dik'tāt), n. 1. An order delivered; and in the stems of lyccpodiaceous plants.

Diclinous (di'klin-us), a. In crystal, same a command. “Those who servilely confine Dichroic (di-kro'ik), a. Characterized by as Diclinic.

themselves to the dictates of others. Locke. dichroism; as, a dichroic crystal.

Dicoccous (di-kok'us), a. (Gr. prefix di, two, 2. A rule, maxim, or precept, delivered with Dichroism (di'krő-izm), n (Gr. prefix di, and kokkos, a berry) Two-grained; con. authority. twice,and chroa, chroia, the surface of a body, sisting of two cohering grains; as, a dicoccius I credit what the Grecian dictates say. Prior. surface as the seat of colour.) In optics, a capsule.

| 3. Suggestion; rule or direction suggested term used to designate a property possessed Dicælous (di-sēlus), a. [Gr. prefix di, and to the mind; as, the dictates of reason or by several crystallized bodies, of appearing koilos, hollow.) In anat. characterized by conscience. - Sex. Command, injunction, under two distinct colours according to the having two cavities; amphicalous. Prof. suggestion, maxim, precept, admonition. direction in which light is transmitted Owen.

Dictation (dik-tá’shon), n. The act of dicthrough them. Thus the chloride of palla- Dicotyledon (di kot-il-e"don), n. (Gr. predium appears of a deep red colour along the fix da, and kotyledon, a cavity. See Completating or directing; the act or practice of

prescribing; as, you will write the following axis, and of a vivid green when viewed in a DON) A plant whose seeds contain a pair of passage to my dictation. transverse direction. Mica affords another cotyledons or seeil-leaves, which are always

Before the end of the fifteenth century great mili. example, being nearly opaque when viewed opposite to each other. Dicotyledons form tary estal lishments were in tispensable to the dignity in one direction, but transparent and of a a natural class of plants, deriving their and even to the safety of the French and Spanish different colour in another.

name from the embryo. They are further monarchies. If either of these two powers had disDichroite (dikro-it). n. See IOLITE. characterized by their netted-veined leaves,

armed, it would soon have been compelled to submit to the dictation of the other.

Macaulay. Dichromatic (dí-kro-mat'ik), a. (Gr. pre the exogenous structure of their stems, and fix di, and chroma, colour.) Having or pro by having the parts of the flower constructed Dictator (dik'ta-tėr), . [L] 1. In ancient ducing two colours. on the plan of fire. The class is divided

Rome, a magistrate created in times of exiDichroscope (diskrő-skop), n. (Gr. prefix di, into four sub-classes: Thalamiflora, Calyci

gence and distress, and invested with unlitwice, chroa, colour, and xkopeo, to see.) An floræ, Corolliflora, and Jonochlamydeæ

mited power. His term of office was six instrument, usually consisting of an achro- | (which see respectively). The class re

months. – 2. One invested with absolute matized double-image prism of Iceland-spar, i ceives also the name of erogens, from their

authority.-3. One whose credit or authority fixed in a brass tube, which has a small square stems being formed by additions to the

enables him to direct the conduct or opinion hole at one end and a convex lens at the outer parts in the form of rings or zones.

of others. The great dictator of fashions.' other, of such a power as to give a sharp See EXOGENS.

Pope. image of the square hole. On looking through Dicotyledonous (di’kot-il-e"don-us), a. Hav. Dictatorial (dik-ta-toʻri-al), a. 1. Pertainthe instrument the square hole appears ing two lobes; thus, a dicotyledonous plant is

ing to a dictator; absolute; unlimited; undouble, and this enables the dichroism of one whose seeds have two lobes or coty.

controllable. Military powers quite diecrystals to be tested, since if a dichroic ledons.

tatorial.' W. Irring.--2 Imperious; dog. crystal is placed in front of it the two Dicotyles (di-kot'il-ez), n. (Gr. dys, ill, and

matical; overbearing. "The disagreeable images will appear of different colours. A kotytă, a cavity. The proper form of the

effect that accompanies a tone inclined to dichroscope is frequently combined with the word is dycotyles, which form is used by Dictatorially (dik-ta-to'ri-al-li), ado. In an

be dictatorial.' Disraeli polarizing apparatus of a microscope. some authorities.) A genus of pachydermaDichroscopic (di-kro-skop'ik), a. Pertain tous mammalia, containing the peccary.

imperious, dogmatical manner. ing to dichroism, or to observations with It possesses a curious glandular organ on

Dictatorian (dik-ta-to'ri-an), a. In the the dichroscope. the back, which secretes a strongly-scented

manner of a dictator; arbitrary; dictatorial. Dicing-house (dis'ing-hous), n. A house fluid, which exudes from an orifice. See Dictatorship (dik'tat-ėr-ship), n. 1.

Dictatorian power.' Sir M. Hale.

he where dice is played; a gaming-house.

The public peace cannot be kept where public
Dicranaceæ (di-kran-a'sē-ė), n. pl. A family

office of a dictator; the term of a dictator's dicing houses are permitted.

office. - 2 Authority; imperiousness; dog. Fer. Taylor.

of apocarpous operculate mosses, branchDickens (dik'enz), interj. (Probably a faning by innovations, or with the tops of the

matism. “That perpetual dictatorship which fertile branches several times divided It

is exercised by Lucretius.' Dryden. ciful euphemism for deril; comp. L.G. duker, includes some of the most common of Bri. Dictatory (dik'ta-to-ri),

a. Overbearing; dogduks, the deuce.) Devil; deuce: used intertish mosses, very varied in size and habit.

matical. jectionally. 'I cannot tell what the dickens Dicrotic (di-krot'ik), a. (Gr. prefix di,

Our English, the language of men ever famous and his name is.' Shak.

foremost in the achievements of liberty, will not and kroteò, to make to ratile, from krotos, easily find servile letters enow to spell such a didaDicker (dik'ér), n. (LG. and Sw. deker,

a noise made by striking one thing against tory presumption Englished. G. dechet, ten hides of skin, from L. L dacra, de cara, with same sense-L. decem, ten.)

another.) A term applied to the pulse, Dictatress, Dictatrix (dik-tá'tres, dik-ta'The number or quantity of ten, particularly

where the artery conveys the sensation of a triks), n. A female dictator; a female who

double pulsation ten hides or skins; as, a dicker of hides; a Dicrurinæ (di-krö-ri'nė), n. pl. Drongo

commands authoritatively and irrespondicker of gloves, &c.

sibly. Dicker (dik'ér), v.t. To barter. “Ready to

shrikes, a sub-family of dentirostral birds, Dictature (dik'ta-tūr), n. The office of a

order Passeres and family Ampelidæ. In dicker and to swap.' Cooper. (American.)

dictator; dictatorship; absolute authority. Dickey, Dicky (dik'i), n.

general appearance they resemble crows. Bacon.

[In first two The sub-family includes the bee-eater of Diction (dik’shon), n. [L. dictio, from dico, senses probably connected with D. dekken, G. decken, A. Sax, theccan, to cover. In the

South Africa, called by the Hottentots to speak.] Expression of ideas by words;

devil-bird, from their believing it to be confourth sense (perhaps also in some of the

style; manner of expression; choice or selecothers) may be diminutive of Richard; comp. ' cereus, the king of the crows of Bengal, D.

nected with their sorcerers, Dicrurus macro- tion of words. jack in jackass.) 1. A leather apron; a child's

The miserable failure of Dryden in his attempt to cristatus and D. musicus, whose notes have bib.-2. A shirt-front; a front worn over the

translate into his own diction some parts of Paradise

Lost. been compared to those of the thrush

Macaulay. breast in place of a shirt, or to hide a shirt which the wearer does not wish to be seen.

and nightingale. The Dicrurinæ are found Diction, Phraseology, Style. Diction refers 3. The seat in a carriage on which the driver

in India, China, Madagascar, and South chiefly to the language adopted, the words sits, whether in front or not; the seat at the Dicrurus (di-krö'rus), n. A genus of passerAfrica

used, in any piece of composition; phraseback part of a carriage for servants, &c.

ology refers more to the manner of framing ine birds of the family Ampelidæ and sub the phrases, clauses, and sentences; style Three people were squeezed into it besides the family Dicrurinæ (which see).

includes both, referring to the thoughts as





well as the words in which they are ex- Didactically (di-dak'tik-al-li), adv. In a opossums of Guiana and Brazil have this pressed, and especially comprehends the didactic manner; in a form to teach.

organ in a rudimentary condition. The niceties and beauties, the higher or artistic Didactics (di-dak'tiks), n. The art or science generic name was formerly used to include qualities of the composition. of teaching

all the animals now grouped under DidelThe style of Burke was enriched with all the higher Didactyl, Didactyle (di-dak’til), a. [Gr. phia (which see) graces of composition; his diction was varied and prefix di, and daktylos, the finger.) Having Diden, pret. pl. from do. Did. Chaucer. copious; his phraseology at times was careless and cumbersome.

two toes or two fingers. Goodrich.

Dididæ (didi-dē), n. pl. A family of birds of Dictionarian (dik-shon-ā'ri-an), n. The Didactyl, Didactyle (di-dak’til), n. An ani

which the genus Didus is the type. See compiler of a dictionary; a lexicographer. Didactylous (di-dak'til-us), a. Two-toed or

DODO. Dawson. (Rare.)

Didine (di'dīn), a. Pertaining to the family Dictionary (dik'shon-a-ri), n. (Fr. dictiontwo-fingered; having two toes only.

Didida. naire, from L. L. dictionarium, from le dic: Didapper (did'ap-er), n. [For divedapper Didodecahedral (di-dö'de-ka-hē"dral), a. tio, a saying, a word.] 1. A book containing

(Shak.), from dive, and dap=dip. See DAB [Gr. prefix di, and E. dodecahedral) In the words of a language arranged in alpha

CHICK.) The dab-chick (Podiceps minor); crystal. having the form of a dodecahedral betical order, with explanations or defini. Didascalar, Didascalic (di-das’ka-ler, di- Didrachm, Didrachma (di’dram, di-drak':

the little grebe, which dives into the water. prism with hexahedral summits. tions of their meanings; a lexicon; a vocabulary; a word-book.

das-kal’ik), a. [Gr. didaskalikos, from diIn addition to de

ma), n. (Gr.] A piece of money, the fourth daskő, to teach. ) Didactic; preceptive; finitions, the larger dictionaries give the

of an ounce of silver. etymology, pronunciation, and different Didder (did'der), v... [Same word as diddle, giving precepts. (Rare.)

Didst (didst). The second pers. of the pret.

of do. forms of spelling of the words, and occasionally are enriched with illustrative engrav

to tremble and to deceive; A. Sax. dyderian, Diducementt (di-dūs'ment), n. Division; ings, &c.-2. Any work which professes to

to deceive, originally probably to deceive separation into distinct parts. communicate information on an entire sub

by rapid movements of sleight of hand; akin Diduction (di-duk'shon), n. [L. diductio

to Prov. E. dadder, dodder, to shake or ject or branch of a subject, under words or

di for dis, implying separation, and duco, tremble; G. zittern, to tremble; E. totter, heads arranged alphabetically; as, a biogra

to draw.] Separation by withdrawing one phical dictionary. - Vocabulary, Dictionary,

and perhaps titter. See Wedgwood's expla part from the other. Glossary. See under VOCABULARY.

nation under DIDDLE.) To shiver with or Diductively (di-duk’tiv-li), adv. By diduc

as with cold. Sherwood. (Provincial.) Dictionary (dik'shon-a-ri), a. of or per- Diddle (did'dl), v.t. (See DIDDER. To move

tion or separation. Sir T. Browne. taining to, contained in, or given by a dic

Didus (di'dus), n. The generic name for the tionary or dictionaries. The dictionary

rapidly backwards and forwards; hence, to dodo (which see). meaning of this term. J. S. Mill.

employ action to occupy the attention, so Didym, Didymium (di'dim, di-di'mi-um), Dictum (dik'tum), n. pl. Dicta (dik'ta). (L.)

as to deceive when performing juggling n. [Gr. didymos, double, twofold, twin.)

tricks. Wedgwood.] To cheat. [Slang.) 1. In law, an arbitrament; an award; the

Sym. Di. A rare metal discovered by sentence of an arbitrator. — 2. A positive

I should absolutely have diddled Hounslow if it had Mosander in 1841 in the oxide of cerium,

not been for her confounded pretty face fitting about assertion; an authoritative saying. Criti

and so named from being, as it were, the my stupid brain.

Disraeli. cal dicta everywhere current. Matt. Ar- Diddle (did’dl), v.i. To totter, as a child in

twin-brother of lanthanium, which was prenold.

viously found in the same body, whose comwalking; to move rapidly up and down, or Dictyogenous (dik-ti-o'jen-us), a. In bot.

pounds those of didymium greatly resemble, backwards and forwards; to jog; to shake. having the character of a dictyogen; having

and from which they are separated with [Provincial and Scotch.] the general character of an endogen, but

great difficulty. Didymium never occurs

Burns. with netted leaf-veins.

Lang may your elbuck jink and diddle.

free, nor even as a free salt, but always Dictyogen (dikʼti-o-jen), n. [Gr. dictyon, Diddler (diddler), n.

A cheat. [Slang.)

associated with cerium and lanthanium. net-work, and gennaõ, to produce.) In bot.

Didecahedral (di - de’ka-hē" dral), a. (Gr. Didymograpsus (di'di-mo-grap'sus), n. (Gr. the name given by Lindley to a group of

prefix di, and E. decahedral.) În crystal. didymos, double, and grapsus, a short form monocotyledonous plants, with net-veined having the form of a decahedral, or ten intended to mean graptolite.) A genus of leaves, intermediate between the monoco sided, prism with pentahedral, or five-sided, Graptolitidæ, in which the cells are placed tyledons and dicotyledons. Their annual summits.

on one side of each of two branches which branches or aerial stems have the endoge- Didelphia (di-del'fi-a), n. pl. [See DIDEL spring from a common point. nous structure, but the rhizomes have often

PHYS.) One of the three sub-classes of Mam- Didymous (di'di-mus), a. (Gr. didymos, pith, medullary rays, and circular, wedge

malia (the other two being Ornithodelphia double.) In bot. twin, growing double, as like arrangement of woody matter, as in

and Monodelphia), founded on the nature of the fruits of umbelliferous plants, the anexogens. They are distinguished also by net

the female reproductive organs. The Didel thers of bedstraw, or the tubers of some veined, in place of parallel-veined, leaves,

phia are characterized by the fact that the orchids. which usually disarticulate with the stem.

uterine dilatations of the oviducts continue Didynam (di’di-nam), n. [Gr. prefix di, and Dioscoreaceæ or yams, and Smilaceæ or sar distinct throughout life, opening into two dynamis, power. See DIDYNAMIA.) In bot. saparillas, are the most important natural

distinct vaginæ, which in turn open into a a plant of four stamens, disposed in two orders referred to this class.

urogenital canal, distinct from the rectum, pairs, one being shorter than the other. Dictyophyllum (dik-ti-of'il-lum), n. (Gr.

though embraced by the same sphincter Didynamia (di-di-na'mi-a), n. pl. (Gr. di for diktyon, net-work, and phyllon, a leaf.) A

muscle. The young of this sub-class are provisional genus intended to include all born imperfect, or, as it were, prematurely, fossil dicotyledonous leaves, the affinities of and are carried in the pouch or second womb which are not known.

till perfect. It contains but one order, the Dictyoteæ (dik-ti-o'tė-ē), . pl. An order of Marsupialia, represented by such animals algæ, with dark seeds, superficial spores or

as the kangaroos, wombats, &c., of Auscysts, arranged in spots or lines, fronds flat

tralia, and the opossums of America. or thread-like, and occasionally branched Didelphian, Didelphic (di-del'fi-an, di-del'and tubular.

fik), a. Pertaining to the group Didelphia. Dicynodon (di-si'no-don), n. (Gr. di for dis, Didelphid (di-del'id), n. A member of the two, kyon, a dog, and odous, odontos, tooth.] group Didelphia A fossil genus of animals occurring in South Didelphid (di-delfid), a. Same as DidelAfrica, and supposed to be of triassic age,

phian. combining in structure the characters of the Didelphidæ (di-del'i-dē), n. pl. A family of lizard, crocodile, and tortoise. Their most marsupial mammals, of which the genus prominent feature is the possession of two Didelphys is the type. large tusks like those of the walrus, pro- Didelphyc (di-dei’fik), a. Same as Didel. bably used as weapons of defence, whence phian.

Didynamia. the name.

Didelphys (di-del'fis), n. (Gr. prefix di, Dicynodontia (di-si'no-don''shi-a), n. pl. See and delphys, womb.) A genus of marsupial

A, Gymnospermia (Teucrium Scorodonia). , Sta

minad, Divided ovary. e, Section of ditto. ANOMODONTIA. mammals, including the opossums of Cen

B, Angiospermia (Antirrhinum majus). <, Sta. Did (did), pret. of do, formed by reduplica

tral and Southern America. The Virginian mina. d, Capsule. e, Section of ditto. tion of the simple verb, and therefore=dodo. This is perhaps the oldest mode of indicat

dis, twice, and dynamis, power, from the ing past time: comp. L. fallo, fefelli; cano,

two larger stamens appearing to domineer cecini; Gr. typtó, tetypha; graphó, gegrapha.

over the shorter.) The fourteenth class in In the Teutonic tongues past time came to

the Linnæan system of plants. The plants be indicated not by reduplicating the stem

have four stamens, of which two are longer

than the other two. It is divided into two but by affixing did to it, e.g. Goth. salboded-um, salve (anoint)-did-we, tami-ded-um,

orders--Gymnospermia, having the fruit tame-did-we. This auxiliary did has now

composed of single-seeded achenes, which been attenuated to ed. It is noteworthy that

Linnaeus mistook for naked seeds, and in later English did comes to be again used

Angiospermia, with many seeds inclosed in

an obvious seed-vessel. as an auxiliary, but this time before the verb. See ED.

Didynamian, Didynamic (di-di-na'mi-an, Didactic, Didactical (di-dak'tik, di-dak'

di-di-nam'ik), a. In bot. containing four tik-al), a. (Gr. didaktikos, from didasko, to

stamens, disposed in pairs, one shorter than

the other. teach.] Adapted to teach: preceptive; containing doctrines, precepts, principles, or

Didynamous (di-din'am-us), a. In bot. rules; intended to instruct. The finest di

same as Didynamian. dactic poem in any language.' Macaulay.

Die (di), v.i. pret. & pp. died; ppr. dying.

[The verb die does not appear in the A. Sax. Deep obligations lie upon you .. not only to be blameless, but to be didactic in your lives.

Virginian Opossum (Didelprys virginiana).

The earliest E. forms are such as deye, Jer. Taylor

deghen, &c.; closely allied to the 0. Fris. deja, Didactic (di-dak'tik), 1. A treatise on edu or common opossum (D. virginiana) has deya, Icel. deya, deyja, Dan. döe, to die. The cation. Milton.

the marsupial pouch well developed; the A. Sax., however, has dead, dead, a kind of








participial form as well as death, death, sible. It is said that West Indian planters tables, commissioners' rules, sub-commissioners' reused to punish refractory slaves by causing

ports. both from this stem.] 1. To cease to live;

Disraeli. to expire; to decease; to perish; to suffer them to chew it.

Diet-bread (di'et-bred), n. Bread medicated death; to lose life.

Diegesis (cli-e-je'sis), n. (Gr., from diégeo or regulated by a physician. All the first born in the land of Egypt shall die.

mai, to relate tell, recount, declare. A Diet-drink (di'et-dringk), n. Medicated

Ex. xi. 5. narrative or history; a recital or relation liquor; drink prepared with medicinal "Whom the gods love die young,' was said of yore. Dielectric (ili-e-lek'trik), n. (Gr. prefix dia ingredients.

Eyron . and E. electric ) In elect any medium Dieter (cli'et-ér), n. One who diets; one who This word is followed by of or by to express

through or across which static induction prescribes rules for eating; one who prethe immediate cause of death; by for, to

takes place.

pares food by rules.

Sauced our broths, express the object or occasion; as, to die of Dier, n. Same as Dyer.

as Juno had been sick, and he her dieter.
small-pox; to die by violence.
Dieresis (di-e're-sis), n. See DIERESIS.

Christ died for the ungodly. Rom. v. 6. Diervilla (di-er-vil'la), n. (From M. Dier. Dietetic, Dietetical (di-et-et'ik, di-et-et'ik-

Christ died for our sins. 1 Cor. xv. 3 rille, who sent it from Canada to Tourne al), a. (Gr diaitētikos, pertaining to diet,
2. To come to an end; to cease; to be lost; fort.) A genus of caprifoliaceous plants See Diet, food. ) Pertaining to diet, or to
to perish or come to nothing. 'Letting the consisting of erect shrubs from North Ame the rules for regulating the kind and quan-
secret die within his own breast.' Spectator. rica, China, and Japan. They are nearly tity of food to be eaten.
The year is dying in the night;

allied to the honeysuckle, but have a fun- Dietetically (di-et-et'ik-al-li), adv. In a Ring out, wild bells, and let him die. Tennysor. nel-shaped three-cleft corolla, and a two

dietetical manner. By labour and intent study (which I take to be my celled capsule. Some of the species are Dietetics (di-et-et'iks), n. That department portion in this life), joined with the strong propensity called Weigelia in the gardens. The best of medicine which relates to the regulation of nature, I might perhaps leave something so written known species is D. canadensis, a hardy

of diet, to aíter times, as they should not willingly let it die.


shrub with yellow flowers which appear Dietetist (di-et-et'ist), n. A physician who 3. To sink; to faint. early in summer.

treats or prescribes dietetics. His heart died within him, and he became as a

Die-sinker (di'singk-ér), n. An engraver of Dietine (di'et-in), n. [fr. diétine.) A substone.

1 Sam. XXV. 37.
dies for stamping or embossing.

ordinate or local assembly; a diet of inferior

The 4. To languish with pleasure or tenderness: Die-sinking (di'singk-ing), n.

rank; a cantonal convention.

process followed by away.

of engraving dies for stamping coin, me Dietist, Dietitian (di'et-ist, di-et-i'shan), To sounds of heavenly harp she dies away. Pope. dals, &c.

One skilled in diet; a dietetist.
Dies Iræ (di'ez i'rē). [L., lit. day of wrath.) Diffame,t n. (Fr.) Bad reputation. Chau-
5. To languish with affection.

The name of a famous mediæval hymn on
The young men acknowledged that they died for the last judgment, probably composed by Diffarreation (dif-fa'rē-ā"shon), n. [L. dif.

Tatler. Thomas of Celano in the thirteenth cen. farreatin-prefix dif, dis, and farreum, a 6. To become gradually less distinct or per tury, beginning

spelt cake, from far, a sort of grain, spelt ] ceptible to the senses; to become less and

Dies ira, dies illa,

The parting of a cake made of spelt: a cereless; to vanish from the sight or disappear

Solvet szeclum in favilla,

mony among the Romans at the divorce of gradually; to cease gradually: generally

Teste David cum Sibylla.

man and wife. followed by away; as, the sound died, or Diesis (di-e'sis). n. (Gr. diesis, a division.) | Differ (dif'fer), v. i. (L. differo-prefix dif, dis, died array, in the distance; I watched his 1. In printing, the mark !. Called also Double and fero, to bear or move apart. See BEAR.] figure dying, or dying away, in the distance. dagger. --2. In music, the division of a tone 1. To be unlike, dissimilar, distinct, or The living airs of middle night

less than a semitone; or an interval consist various, in nature, condition, form, or quali. Died round the bulbul as he sung Tennyson. ing of a less or imperfect semitone

ties; as, men differ from brutes; a statue The curious zigzag with which its triangles die

Dies non (di'ëz non). (L.) In law, a day differs from a picture; wisdom differs from awy against the sides of the arch, exactly as waves on which courts are not held, as the Sab folly. break upon the sand, is one of the most curious fea. bath, &c.; a blank day.

One star differeth from another star in glory. tures of the structure, Ruskin. Die-stock (di'stok), 11. The contrivance by

1 Cor. xv. 41. 7. To lose vegetable life; to wither; to per which the dies used in screw-cutting are 2. To disagree; not to accord; to be of a ish, as plants or seeds; as, the plant died held. It is of various forms.

contrary opinion. for want of water; some plants die annu Diet (diet), n. [Gr. dia ita, (1) a way of liv. If the honourable gentleman differs with me on ally.-8. To become vapid or spiritless, as ing; (2) a prescribed manner of life, diet; that subject, I differ as heartily with him Canning. liquors.-9. In theol. to suffer divine wrath (3) a dwelling, abode] 1. Food or victuals; 3. To contend: to be at variance; to strive and punishment in the future world. as, milk is a wholesome diet; flesh is a or debate in words; to dispute; to quarrel. 10. To become indifferent to, or to cease to nourishing diet.

We'll never differ with a crowded pit. Roue. be under the power of; as, to die to sin.

Good broth with good keeping do much now and 11. To endure great danger and distress. then;

[In the second sense differ is followed by I die daily.' i Cor. xv. 31.-To die out, to Good diet with wisdom best comforteth men.

with or from; in the first sense almost become extinct gradually.

Tusser always by from. 1-SIN. To vary, disagree,

2. Course of food regulated by a physician dissent, dispute, contend, quarrel, wrangle. The system of bribery did not long survive the ministry of Lord North. It may not have wholly died

or by medical rules; food prescribed for the Differ (différ), v.t. To cause to be different out; and has probably since been resorted to on rare prevention or cure of disease, and limited or various. (Rare.) and exceptional occasions. T. Erskine May. in kind and quantity; as, I adhered strictly Something 'tis that differs me and thee, Cowley. Die (di), n. (O. Fr. det, Fr. , Pr. dat, It. to the prescribed diet.

Differ (dif'iér), n. Difference. (Scotch.) dado, derived by some from L. datum, I commend rather some diet for certain seasons something given, hence what is thrown or

than frequent use of physic.


Ye see your state wi' theirs compared,

And shudder at the niffer, laid on the table; by others from Ar.daddon, 3. Allowance of provision.

But cast a moment's fair regard, a game of dice.] 1. A small cube marked on


What mak's the mighty differ. For his diet there was a continual diet given him its faces with numbers from one to six, of the king of Babylon.

Jer. lii. 34. Difference (dif'fer-ens), n. 1. The state of
used in gaming by being thrown from a box.
Diet (di'et), v.t. 1. To feed; to board; to fur-

being different, discordant, or unlike; dis-
I have set my life upon a cast,
nish provisions for; as, the master diets his

agreement; want of sameness; variation;
And I will stand the hazard of the die, Shak.
apprentice.-2. To prescribe food for; to

dissimilarity; change; as, there is a differ. 2. Any cubic body; a flat tablet. 'Words regulate the food or regimen of.

ence in nature between animals and plants; pasted upon little fat tablets or dicc.'

a difference in degrees of heat or of light.

We have dieted a healthy body into a consumption Watts. ---3. + Hazard; chance. Such is the by plying it with physick instead of food. Swift.

She lired unknown, and few could know die of war.' Spenser.---4. In arch. the cubi

When Lucy ceased to be;
We shall not then have his company to night?

But she is in her grave, and oh! cal part of a pedestal between its base and Not till after midnight, for he is dicted to his hour,

The difference to me.

Wordsworth, cornice.-- 5. A stamp used in coining money,

Shak. in foundries, &c. Diet (di'et), v.i. 1. To eat according to rules

2. The quality which distinguishes one Sighing that Nature formed but one such man prescribed; as, to diet for the removal of

thing from another; the opposite of resem. And broke the die-in moulding Sheridan. Ryron. disease.-2. To eat; to feed.

blance; as, on difference and its opposite, re6. One of two or more pieces of hardened

Inbred worm

semblance, scientific classification depends. steel forming together a female screw for

That diets on the brave in battle fallen. Corper.

3. Dispute; debate; contention; quarrel;

controversy. cutting the threads of screws. In being Diet (di'et), n. [Fr. diete; L.L. dieta, the used they are fitted into a groove, in a con space of a day, from L. dies, a day. Comp.

What was the difference! It was a contention in public.

Shak. trivance called a die-stock. [In the first and G. tag, in the words Reichstag and G. Swiss second senses the plural is dice; the third Tag-satzung, and dag in D. Ryksdag--adiet.]

4. The point in dispute; ground of controsense hardly admits of a plural; in the A meeting, as of dignitaries or delegates,

versy. fourth, fifth, and sixth senses the plural is holden from day to day for legislative, poli

Are you acquainted with the difference regular, dies) tical, ecclesiastical, or municipal purposes;

That holds the present question in the court? Shak, Diet (di), v. t. To dye; to tinge. Chaucer. meeting; session; specifically, the legisla

5. Evidences or marks of distinction. The Dieb (di'eb), n. A wild species of dog found tive or administrative assemblies in the Ger marks and differences of sovereignty'. Dain North Africa (Canis anthus).

man Empire, Austria, tc.; as, the diets of ries. ---6. The act of distinguishing; discriDiecian (di-e'shi-an), n. See DIECIAN.

Worms (1495 and 1521); the diet of Spires mination.
Diecious (di-ē'shus), a. Same as Diocious. (1529), of Augsburg (1530); the dicts of the To make a difference between the clean and the
Diedral (di-e'dral), a. (See DIHEDRAL) Swiss cantons, &c. - Diet of compearance,


Lev. xi. 47. Having two sides; dihedral.

in Scots law, the day to which a party in a 7. The remainder of a sum or quantity after Dieffenbachia (dēf-en-bak'i-a), n. (After civil or criminal process is cited to appear a lesser sum or quantity is subtracted; the M. E. Diessenbach, a German naturalist. ] in court.

quantity by which one quantity differs from A genus of South American and West Indian Dietary (di'et-a-ri), a. Pertaining to diet or another.--8. Inlogic, the same as Differentia. plants, nat.order Aracea, having large fleshy the rules of diet.

9. In her, a certain figure added to a coat stems 2 to 8 feet long, partly lying on the Dietary (di'et-a-ri), n. A system or course of arms, serving to distinguish one family ground and partly erect. D. seguina has of diet; rule of diet; allowance of food, es from another, or to show how distant a been called dumb cane, because, from its pecially that for the inmates of a prison, younger branch is from the elder or princi. extreme acridity, the mouth of any one who poorhouse, and the like.

pal branch.-SYN. Distinction, dissimilarity, bites it swells so as to render speech impos Lord Henry would not listen to statistics, dietary contrariety, dissimilitude, variation, diver

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sity, variety, disagreement, variance, contest, contention, dispute, controversy, debate, quarrel, wrangle, strife. Difference (dif'fer-ens), v.t. pret. and pp. differenced; ppr. differencing. To cause a difference or distinction in; to distinguish; to discriminate.

In the Samson Agonistes, colloquial language is left at the greatest distance, yet something of it is preserved, to render the dialogue probable; in Mas. singer the style is differenced, but differenced in the smallest degree possible, from animated conversation by the vein of poetry.

Coleridge. Different (dif'fér-ent), a. 1. Distinct; separate; not the same; as, we belong to different churches or nations.-2. Various or contrary; of various or contrary natures, forms, or qualities; unlike; dissimilar; as, different kinds of food or drink; different states of health ; different shapes; different degrees of excellence. Differentia (dif-fér-en'shi-a), n. In logic, the characteristic attribute of a species, or that by which it is distinguished from other species of the same genus; specific difference.

Whatever term can be affirmed of several things, must express either their whole essence, which is called the species, or a part of their essence (viz., either the material part, which is called the genus, or the formal and distinguishing part, which is called differentia, or, in cominon discourse, characteristic), or something joined to the essence. Whately. Differential(dif-fer-en'shi-al), a. 1. Making a difference or distinction; discriminating; distinguishing; special. “For whom he procured differential favours.' Motley.-2. In math. an epithet applied to an infinitely small quantity, so small as to be less than any assignable quantity; pertaining to a dif. ferential or differentials, or to mathematical processes in which they are employed. Diferential calculus. See CALCULUS.Differential coefficient, the ratio of the differential of any function of a variable to the differential of the variable.

See DIFFERENTIAL, n. -- Differential equation, an equation involving or containing differential quantities. -- Differential coup

To ac

fixed on the same axis are made to com the two balls. As long as both balls are of municate motion to other two wheels on the same temperature the coloured liquid separate axes, the velocities of the latter remains stationary; but if, for instance, the axes differing proportionally to the differ ball which holds a portion of the liquid be ence of the diameters of the respective warmer than the other, the superior elasti. wheels acting upon them, or to their num city of the confined air will drive it forwards, bers of teeth. This combination is exten and make it rise in the opposite branch sively employed in lathes and boring-ma above the zero, to an elevation proportional chines.-Differential motion, in mech. an to the excess of elasticity, or of heat. adjustment by which a single combination Differential (dif-fer-en'shi-al), 11. In math. is made to produce such a degree of velocity, an infinitesimal difference between two as by ordinary arrangements would require a states of a variable quantity. In the difconsiderable train of mechanism practically ferential and integral calculus, if two or to reduce the velocity. The Chinese or more quantities are dependent on each diferential windlass is an example of this other, and subject to variations of value, kind of motion. The two cylinders A and their differentials are any other quantities B, a little different in diameter, have a whose ratios to each other are the limits to common axis, and the cord winds from which the ratios of the variations approxi. the one upon the other when the axis is mate, as these variations are reduced nearer made to revolve, by which means a vertical and nearer to zero. motion is com

Differentiate (dif-fér-en'shi-āt), v.t. 1. To municated to

produce, or lead to, a difference. the pulley C

Believing that sexual selection has played an im. equal to half the

portant part in differentiating the races of man, he difference of the

has found it necessary to treat this subject in great surface veloci


A.R. W'allace. ties of the two

2. To mark or distinguish by a difference; cylinders A and

as, colour of skin differentiates the races of B; or equal to

man.--3. To assign a specific act or agency the velocity that

to; to set aside for a definite or specific purwould be ob

pose. tained if the

In zoology, the vital functions are said to be more centre of the

and more differentiated, when, instead of several pulley C were

functions being performed by the same organ, each suspended by a

function is performed by an organ specially devoted to it.

Page. cord

wrapped round a single

4. In logic, to discriminate between, by ob

serving or describing the marks of differbarrel,whose ra

entiation, or the differentia. --5. In math. dius is half the Differential Motion.

to obtain the differential, or the differential difference of the

coefficient of; as, to differentiate an equation. radii of the cylinders A and B. Thus, al. Differentiate (dif-fer-en'shi-āt), v.i. though theoretically a barrel with a radius

quire a distinct and separate character. equal to that difference would do as well as

Huxley. the double barrel, yet its diameter in prac- Differentiation (dif-fér-en'shi-ā"shon), n. tice would be so small as to make it use

1. The formation or discrimination of difless from weakness; whereas, the barrels

ferences or varieties. The mode of the of the differential combination may be of

differentiation of species.' Agassiz.-2. The any diameter and strength necessary for

assignment of a specific agency to the the weights to be lifted. (See under

discharge of a specific function, as the asWHEEL.) When a differential motion is

signment of a particular faculty in a univereffected by means of toothed wheels, the combination takes the name of differential gear

sity to the study and teaching of a particu

lar branch of knowledge. (which see). - Differential screw, in mech., a

The Faculties arose by process of natural differen. compound screw, whereby a differential mo

tiation out of the primitive University. Huxley, tion is produced--as exemplified by the annexed figure. The pitch of the threads

3. In biol. the formation of different parts, organs, species, &c., by the production or acquisition of a diversity of new structures, through a process of evolution or

development, as when the root and stem 2012

of a plant are developed from the seed, or the leaves, branches, and flowers from the stem, or when animals, as they advance in type of organization, acquire, more and more, specific organs for the performance of specific functions, in place of one organ, as in the lower organisms, serving for heart,

stomach, lungs, &c.; specialization. Differential Screw.

Differentiation is, therefore, a mark of higher

organization--the higher the animal in the scale of at A and B being different, when motion is

being, the more specialized is its organization. communicated to the screw, the piece o

Page. (prevented from revolving) is made to slide 4. In math. the act of differentiating; the parallel the axis, by a quantity equal to operation of finding the differential of any the difference of the pitches of the two

function. parts A and B in each revolution. Hunter's Differently (différ-ent-li), adv. In a differscrew (which see) is another example of the ent manner; variously; as, men are differsame kind. - Differential thermometer, an

ently affected with the same eloquence. instrument for measuring very small differ Differingly (dif'fér-ing-li), adv. In a different ences of temperature, invented and first manner. applied by Sir John Leslie. Two glass tubes, Difficilet (dif'fi -sil), a. Difficult; hard; each terminating in a hollow ball, and hav scrupulous. "The cardinal finding the pope ing their bores somewhat widened at the difficile in granting the dispensation.' Bacon. other ends, a small portion of sulphuric acid Latin was no more difficile, tinged with carmine

Than to a blackbird 'tis to whistle. Hudibras. being introduced into

Difficileness t (dif'fi-sil-nes), 1. Difficulty; the ball of one, are

specifically, difficulty to be persuaded; imjoined together by

practicability; incompliance. the flame of a blow

The lighter sort of malignity turneth but to a pipe, and afterwards

crossness, or frowardness, or aptness to oppose, or bent into nearly the

difficileness, or the like.

Bacou. shape of the letter U.

Difficult (difff-kult), a. (See DIFFICULTY. ) To one of the legs of

1. Hard to make, do, or perform; not easy: the thermometer so

attended with labour and pains; arduous; formed a scale is at

as, our task is difficult; it is difficult to pertached; and the li

suade men to abandon vice; it is difficult to quid contained in the

ascend a steep hill, or travel a bad road. tube is so disposed

2. Hard to be pleased; not easily wrought that it stands in the

upon; not readily yielding; not compliant; graduated leg oppos

unaccommodating; rigid; austere; not easily ite the zero of the

managed or persuaded ; as, a difficult man; scale when both balls Differential Thermometer. a person of a difficult temper.-3. Hard to are exposed to the

understand; occasioning labour or pains; as, same temperature, so that the instrument a difficult passage in an author.- Arduous, is affected only by the difference of heat of Difficult, Hard. See under ARDUOUS.-SYN.

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Differential Coupling ling, in mach. a form of slip-coupling applied in light machinery for the purpose of regulating the velocity of the connected shaft at pleasure. It cons sts epicycloidal train, such as that represented by the annexed figure. The shaft A, through which the motive power is conveyed, is continuous, and the wheel a a is fast upon it, whereas those marked b and c are loose. The two pinions d d (only one of which is necessary) have their bearings in the wheel ce, and gear with the two wheels a a and b. Motion being given to the shaft A, the wheel 6, which is loose, revolves in a direction contrary to the wheel a a, which is fixed, and the wheel c c remains at rest; but the motion of the wheel b being opposed by means of the friction-gland e, which can be tightened at pleasure by the screw s, the teeth of that wheel become fulcra to the carrier-pinions d d, and these carry round the wheel ce, which, gearing with the wheel hon the second shaft, communicates motion to it of any degree of velocity not greater than half that of the driving-shaft. -- Differential duties, in pol. econ. duties which are not levied equally upon the produce or manufactures of different countries; as, when a tax on certain commodities is lighter in one country than it is on the same commodities in another country. Such duties are also called Discriminating Duties.-Differential gear, in mech. a combination of toothed wheels, by which a differential motion is produced-as exemplified when two wheels

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