Webster's Dictionary, 1913

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Duograph noun [ Latin duo two + -graph .] (Photo-engraving) A picture printed from two half-tone plates made with the screen set at different angles, and usually printed in two shades of the same color or in black and one tint.

Duoliteral adjective [ Latin duo two + E. literal .] Consisting of two letters only; biliteral. Stuart.

Duomo noun [ Italian See Done .] A cathedral. See Dome , 2.

Of tower or duomo , sunny sweet.
Tennyson.

Duotone noun [ Latin duo two + tone .] (Photoengraving) Any picture printed in two shades of the same color, as duotypes and duographs are usually printed.

Duotype noun [ Latin duo two + type .] (Photoengraving) A print made from two half- tone plates made from the same negative, but etched differently.

Dup transitive verb [ Contr. from do up , that is, to lift up the latch. Confer Don , Doff .] To open; as, to dup the door. [ Obsolete] Shak.

Dupable adjective Capable of being duped.

Dupe (dūp) noun [ French, probably from Prov. F. dupe , dube ; of unknown origin; equiv. to French huppe hoopoe, a foolish bird, easily caught. Confer Armor. houpérik hoopoe, a man easily deceived. Confer also Gull , Booby .] One who has been deceived or who is easily deceived; a gull; as, the dupe of a schemer.

Dupe transitive verb [ imperfect & past participle Duped (dūpt); present participle & verbal noun Duping .] [ Confer French duper , from dupe . See Dupe , noun ] To deceive; to trick; to mislead by imposing on one's credulity; to gull; as, dupe one by flattery.

Ne'er have I duped him with base counterfeits.
Coleridge.

Duper noun One who dupes another.

Dupery noun [ French duperie , from duper .] The act or practice of duping. [ R.]

Dupion noun [ French doupion , Italian doppione , from doppio double, Latin duplus . See Double , and confer Doubloon .] A double cocoon, made by two silkworms.

Duple adjective [ Latin duplus . See Double .] Double.

Duple ratio (Math.) , that in which the antecedent term is double the consequent, as of 2 to 1, 8 to 4, etc.

Duplex adjective [ Latin , from duo two + plicare to fold. See Two , and Complex .] Double; twofold.

Duplex escapement , a peculiar kind of watch escapement, in which the scape-wheel has two sets of teeth. See Escapement . -- Duplex lathe , one for turning off, screwing, and surfacing, by means of two cutting tools, on opposite sides of the piece operated upon. -- Duplex pumping engine , a steam pump in which two steam cylinders are placed side by side, one operating the valves of the other. -- Duplex querela [ Latin , double complaint] (Eccl. Law) , a complaint in the nature of an appeal from the ordinary to his immediate superior, as from a bishop to an archbishop. Mozley & W. -- Duplex telegraphy , a system of telegraphy for sending two messages over the same wire simultaneously. -- Duplex watch , one with a duplex escapement.

Duplex transitive verb [ See Duplex , adjective ] (Teleg.) To arrange, as a telegraph line, so that two messages may be transmitted simultaneously; to equip with a duplex telegraphic outfit.

Duplicate adjective [ Latin duplicatus , past participle of duplicare to double, from duplex double, twofold. See Duplex .] Double; twofold.

Duplicate proportion or ratio (Math.) , the proportion or ratio of squares. Thus, in geometrical proportion, the first term to the third is said to be in a duplicate ratio of the first to the second, or as its square is to the square of the second. Thus, in 2, 4, 8, 16, the ratio of 2 to 8 is a duplicate of that of 2 to 4, or as the square of 2 is to the square of 4.

Duplicate noun
1. That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart.

I send a duplicate both of it and my last dispatch.
Sir W. Temple.

2. (Law) An original instrument repeated; a document which is the same as another in all essential particulars, and differing from a mere copy in having all the validity of an original. Burrill.

Duplicate transitive verb [ imperfect & past participle Duplicated ; present participle & verbal noun Duplicating .]
1. To double; to fold; to render double.

2. To make a duplicate of (something); to make a copy or transcript of. Glanvill.

3. (Biol.) To divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves.

Duplication noun [ Latin duplicatio : confer French duplication .]
1. The act of duplicating, or the state of being duplicated; a doubling; a folding over; a fold.

2. (Biol.) The act or process of dividing by natural growth or spontaneous action; as, the duplication of cartilage cells. Carpenter.

Duplication of the cube (Math.) , the operation of finding a cube having a volume which is double that of a given cube.

Duplicative adjective
1. Having the quality of duplicating or doubling.

2. (Biol.) Having the quality of subdividing into two by natural growth. " Duplicative subdivision." Carpenter.

Duplicature noun [ Confer French duplicature .] A doubling; a fold, as of a membrane.

Duplicity noun ; plural Duplicities . [ French duplicité , Latin duplicitas , from duplex double. See Duplex .]
1. Doubleness; a twofold state. [ Archaic]

Do not affect duplicities nor triplicities, nor any certain number of parts in your division of things.
I. Watts.

2. Doubleness of heart or speech; insincerity; a sustained form of deception which consists in entertaining or pretending to entertain one set of feelings, and acting as if influenced by another; bad faith.

Far from the duplicity wickedly charged on him, he acted his part with alacrity and resolution.
Burke.

3. (Law) (a) The use of two or more distinct allegations or answers, where one is sufficient. Blackstone. (b) In indictments, the union of two incompatible offenses. Wharton.

Syn. -- Double dealing; dissimulation; deceit; guile; deception; falsehood.

Dupper noun See 2d Dubber .

Dur adjective [ G., from Latin durus hard, firm, vigorous.] (Mus.) Major; in the major mode; as, C dur , that is, C major.

Dura noun Short form for Dura mater .

Dura mater [ Latin , lit., hard mother. The membrane was called mater , or mother, because it was formerly thought to give rise to every membrane of the body.] (Anat.) The tough, fibrous membrane, which lines the cavity of the skull and spinal column, and surrounds the brain and spinal cord; -- frequently abbreviated to dura .

Durability noun [ Latin durabilitas .] The state or quality of being durable; the power of uninterrupted or long continuance in any condition; the power of resisting agents or influences which tend to cause changes, decay, or dissolution; lastingness.

A Gothic cathedral raises ideas of grandeur in our minds by the size, its height, . . . its antiquity, and its durability .
Blair.

Durable adjective [ Latin durabilis , from durare to last: confer French durable . See Dure .] Able to endure or continue in a particular condition; lasting; not perishable or changeable; not wearing out or decaying soon; enduring; as, durable cloth; durable happiness.

Riches and honor are with me; yea, durable riches and righteousness.
Prov. viii. 18.

An interest which from its object and grounds must be so durable .
De Quincey.

Syn. -- Lasting; permanent; enduring; firm; stable; continuing; constant; persistent. See Lasting .

Durableness noun Power of lasting, enduring, or resisting; durability.

The durableness of the metal that supports it.
Addison.

Durably adverb In a lasting manner; with long continuance.

Dural adjective (Anat.) Pertaining to the dura, or dura mater.

Duramen noun [ Latin , hardness, a hardened, i. e. , ligneous, vine branch, from durare to harden. See Dure .] (Botany) The heartwood of an exogenous tree.

Durance noun [ Old French durance duration, from Latin durans , -antis , present participle durare to endure, last. See Dure , and confer Durant .]
1. Continuance; duration. See Endurance . [ Archaic]

Of how short durance was this new-made state!
Dryden.

2. Imprisonment; restraint of the person; custody by a jailer; duress. Shak . " Durance vile." Burns.

In durance , exile, Bedlam or the mint.
Pope.

3. (a) A stout cloth stuff, formerly made in imitation of buff leather and used for garments; a sort of tammy or everlasting.

Where didst thou buy this buff? let me not live but I will give thee a good suit of durance .
J. Webster.

(b) In modern manufacture, a worsted of one color used for window blinds and similar purposes.

Durancy noun Duration. [ Obsolete] Dr. H. More.

Durant noun [ French durant , present participle of durer to last. Confer Durance .] See Durance , 3.

Durante preposition [ Latin , abl. case of the present participle of durare to last.] (Law) During; as, durante vita , during life; durante bene placito , during pleasure.

Duration noun [ Old French duration . See Dure .] The state or quality of lasting; continuance in time; the portion of time during which anything exists.

It was proposed that the duration of Parliament should be limited.
Macaulay.

Soon shall have passed our own human duration .
D. Webster.

Durative adjective Continuing; not completed; implying duration.

Its durative tense, which expresses the thought of it as going on.
J. Byrne.

Durbar noun [ Hind. darbār , from Per dar...ār house, court, hall of audience; dar door, gate + bār court, assembly.] An audience hall; the court of a native prince; a state levee; a formal reception of native princes, given by the governor general of India. [ India] [ Written also darbar .]

Dure adjective [ Latin durus ; akin to Ir. & Gael. dur ... , stubborn, W. dir certain, sure, confer Greek ... force.] Hard; harsh; severe; rough; toilsome. [ R.]

The winter is severe, and life is dure and rude.
W. H. Russell.

Dure intransitive verb [ French durer , Latin durare to harden, be hardened, to endure, last, from durus hard. See Dure , adjective ] To last; to continue; to endure. [ Obsolete] Sir W. Raleigh.

Yet hath he not root in himself, but dureth for a while.
Matt. xiii. 21.

Dureful adjective Lasting. [ Obsolete] Spenser.

Dureless adjective Not lasting. [ Obsolete] Sir W. Raleigh.

Durene noun [ Latin durus hard; -- so called because solid at ordinary temperatures.] (Chemistry) A colorless, crystalline, aromatic hydrocarbon, C 6 H 2 (CH 3 ) 4 , off artificial production, with an odor like camphor.

Duress noun [ Old French duresse , du... , hardship, severity, Latin duritia , durities , from durus hard. See Dure .]
1. Hardship; constraint; pressure; imprisonment; restraint of liberty.

The agreements . . . made with the landlords during the time of slavery, are only the effect of duress and force.
Burke.

2. (Law) The state of compulsion or necessity in which a person is influenced, whether by the unlawful restrain of his liberty or by actual or threatened physical violence, to incur a civil liability or to commit an offense.

Duress transitive verb To subject to duress. "The party duressed ." Bacon.

Duressor noun (Law) One who subjects another to duress Bacon.

Durga noun (Myth.) Same as Doorga .

Durham noun One or a breed of short-horned cattle, originating in the county of Durham, England. The Durham cattle are noted for their beef-producing quality.

Durian, Durion noun (Botany) The fruit of the durio. It is oval or globular, and eight or ten inches long. It has a hard prickly rind, containing a soft, cream-colored pulp, of a most delicious flavor and a very offensive odor. The seeds are roasted and eaten like chestnuts.