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||Duo"mo (?), n. [It. See Done.] A cathedral. See Dome, 2.

Of tower or duomo, sunny sweet.

Tennyson.

Dup (?), v. t. [Contr. fr. do up, that is, to lift up the latch. Cf. Don, Doff.] To open; as, to dup the door. [Obs.] Shak.

Dup"a*ble (?), a. Capable of being duped.

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

Dupe, v. t. [imp. & p. p. Duped (dpt); p. pr. & vb. n. Duping.] [Cf. F. duper, fr. dupe. See Dupe, n.] 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.

Dup"er (?), n. One who dupes another.

Dup"er*y (?), n. [F. duperie, fr. duper.] The act or practice of duping. [R.]

Du"pi*on (?), n. [F. doupion, It. doppione, fr. doppio double, L. duplus. See Double, and cf. Doubloon.] A double cocoon, made by two silkworms.

Du"ple (?), a. [L. 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.

||Du"plex (?), a. [L., fr. 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 [L., 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.

Du"pli*cate (?), a. [L. duplicatus, p. p. of duplicare to double, fr. 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.

Du"pli*cate, n. 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.

Du"pli*cate (?), v. t. [imp. & p. p. Duplicated (?); p. pr. & vb. n. 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.

Du`pli*ca"tion (?), n. [L. duplicatio: cf. F. 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.