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To open; as, to dup the door. [Obs.] Shak.

Capable of being duped.

One who has been deceived or who is easily deceived; a gull; as, the dupe of a schemer.

One who dupes another.

The act or practice of duping. [R.]

A double cocoon, made by two silkworms.

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

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…

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 duplicat…

The act of duplicating, or the state of being duplicated; a doubling; a folding over; a fold.

Having the quality of duplicating or doubling.

A doubling; a fold, as of a membrane.

Doubleness; a twofold state. [Archaic] Do not affect duplicities nor triplicities, nor any certain number of parts in your division of things. I. Watts.

See 2d Dubber.

Avoirdupois weight.

Folded lengthwise along the midrib, the upper face being within; -- said of leaves or petals in vernation or æstivation.

A doubling together or folding; a duplication. [R.]

The division of that which is morphologically one organ into two or more, as the division of an organ of a plant into a pair or cluster.

Having the edges bent abruptly toward the axis; -- said of the parts of the calyx or corolla in æstivation.

Having induplicate sepals or petals in æstivation.