- (n.) A pitcher or can of waxed leather; -- called also black jack.
- (n.) A large, California rock fish (Sebastodes paucispinus); -- called also boccaccio, and merou.
- (n.) The male of certain animals, as of the ass.
- (n.) A machine for twisting the sliver as it leaves the carding machine.
- (n.) A compact, portable machine for planing metal.
- (n.) A wooden wedge for separating rocks rent by blasting.
- (n.) A system of gearing driven by a horse power, for multiplying speed.
- (n.) A drinking measure holding half a pint; also, one holding a quarter of a pint.
- (n.) The knave of a suit of playing cards.
- (n.) A lever for depressing the sinkers which push the loops down on the needles.
- (n.) The jurel.
- (n.) A mechanical contrivance, an auxiliary machine, or a subordinate part of a machine, rendering convenient service, and often supplying the place of a boy or attendant who was commonly called Jack
- (n.) A large tree, the Artocarpus integrifolia, common in the East Indies, closely allied to the breadfruit, from which it differs in having its leaves entire. The fruit is of great size, weighing from thirty to forty pounds, and through its soft fibrous matter are scattered the seeds, which are roasted and eaten. The wood is of a yellow color, fine grain, and rather heavy, and is much used in cabinetwork. It is also used for dyeing a brilliant yellow.
- (n.) In hunting, the pan or frame holding the fuel of the torch used to attract game at night; also, the light itself.
- (n.) A sawhorse or sawbuck.
- (n.) A device to pull off boots.
- (v. i.) To hunt game at night by means of a jack. See 2d Jack, n., 4, n.
- (n.) A coarse and cheap mediaeval coat of defense, esp. one made of leather.
- (n.) A grating to separate and guide the threads; a heck box.
- (n.) In the harpsichord, an intermediate piece communicating the action of the key to the quill; -- called also hopper.
- (v. t.) To move or lift, as a house, by means of a jack or jacks. See 2d Jack, n., 5.
- (n.) A familiar nickname of, or substitute for, John.
- (n.) A machine for slicking or pebbling leather.
- (n.) A popular colloquial name for a sailor; -- called also Jack tar, and Jack afloat.
- (n.) The small bowl used as a mark in the game of bowls.
- (n.) The wall-eyed pike.
- (n.) A bar of iron athwart ships at a topgallant masthead, to support a royal mast, and give spread to the royal shrouds; -- called also jack crosstree.
- (n.) A flag, containing only the union, without the fly, usually hoisted on a jack staff at the bowsprit cap; -- called also union jack. The American jack is a small blue flag, with a star for each State.
- (n.) An impertinent or silly fellow; a simpleton; a boor; a clown; also, a servant; a rustic.
- (n.) A hood or other device placed over a chimney or vent pipe, to prevent a back draught.
- (n.) A machine or contrivance for turning a spit; a smoke jack, or kitchen jack.
- (n.) A portable machine variously constructed, for exerting great pressure, or lifting or moving a heavy body through a small distance. It consists of a lever, screw, rack and pinion, hydraulic press, or any simple combination of mechanical powers, working in a compact pedestal or support and operated by a lever, crank, capstan bar, etc. The name is often given to a jackscrew, which is a kind of jack.
- (n.) A young pike; a pickerel.