DRUPE n.
A fruit consisting of pulpy, coriaceous, or fibrous exocarp, without valves, containing a nut or stone with a kernel. The exocarp is succulent in the plum, cherry, apricot, peach, etc.; dry and subcoriaceous in the almond; and fibrous in the cocoanut.
DUPLEX a.
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…