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- English Word Jack Definition 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.
- English Word Jack Definition In hunting, the pan or frame holding the fuel of the torch used to attract game at night; also, the light itself.
- English Word Jack Definition In the harpsichord, an intermediate piece communicating the action of the key to the quill; -- called also hopper.
- English Word Jack Definition A familiar nickname of, or substitute for, John.
- English Word Jack Definition A hood or other device placed over a chimney or vent pipe, to prevent a back draught.
- English Word Jack Definition 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.
- English Word Jack Definition An impertinent or silly fellow; a simpleton; a boor; a clown; also, a servant; a rustic.
- English Word Jack Definition A popular colloquial name for a sailor; -- called also Jack tar, and Jack afloat.
- English Word Jack Definition 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
- English Word Jack Definition A device to pull off boots.
- English Word Jack Definition A sawhorse or sawbuck.
- English Word Jack Definition A machine or contrivance for turning a spit; a smoke jack, or kitchen jack.
- English Word Jack Definition A wooden wedge for separating rocks rent by blasting.
- English Word Jack Definition A system of gearing driven by a horse power, for multiplying speed.
- English Word Jack Definition A machine for slicking or pebbling leather.
- English Word Jack Definition A compact, portable machine for planing metal.
- English Word Jack Definition A grating to separate and guide the threads; a heck box.
- English Word Jack Definition A lever for depressing the sinkers which push the loops down on the needles.
- English Word Jack Definition A machine for twisting the sliver as it leaves the carding machine.
- English Word Jack Ketch Definition A public executioner, or hangman.