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Having the heart completely divided or double, one side systemic, the other pulmonary.

An instrument used for double writing, as one for producing embossed writing for the blind and ordinary writing at the same time. -- Dip`lo*graph"ic*al (#), a. -- Dip*log"ra*phy (#), n.

The act or state of seeing double.

Having a double row of columns on each on the flanks, as well as in front and rear; -- said of a temple.

A double catalogue, containing in one part the names of living, and in the other of deceased, ecclesiastics and benefactors of the church; a catalogue of saints.

A mineral of the scapolite group; -- so called from the double effect of fire upon it, in fusing it, and rendering it phosphorescent.

To deprive of ease; to disquiet; to trouble; to distress. [Obs.] His double burden did him sore disease. Spenser.

A double spondee; a foot consisting of four long syllables.

Dividing into double or treble ramifications; -- said of a leaf or stem. [R.] Loudon.

A double trochee; a foot made up of two trochees.

A double reading, or twofold interpretation, as of a Scripture text. [R.]

A spiritual or ghostly double or counterpart; esp., an apparitional double of a living person; a cowalker.

One of a breed of large-bodied domestic fowls, having five toes, or the hind toe double. There are several strains, as the white, gray, and silver-gray. They are highly esteemed for the table.

The act of one that doubles; a making double; reduplication; also, that which is doubled.

A tea party; a kettledrum. G. Eliot. Bass drum. See in the Vocabulary. -- Double drum. See under Double.

State of being dual or twofold; a twofold division; any system which is founded on a double principle, or a twofold distinction; as:

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…