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  • 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 lever for depressing the sinkers which push the loops down on the needles.
  • English Word Jack Definition A grating to separate and guide the threads; a heck box.
  • English Word Jack Definition A machine for twisting the sliver as it leaves the carding machine.
  • English Word Jack Definition A compact, portable machine for planing metal.
  • English Word Jack Definition A machine for slicking or pebbling leather.
  • English Word Jack Definition A system of gearing driven by a horse power, for multiplying speed.
  • 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 In the harpsichord, an intermediate piece communicating the action of the key to the quill; -- called also hopper.
  • 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 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 The small bowl used as a mark in the game of bowls.
  • English Word Jack Definition The male of certain animals, as of the ass.
  • English Word Jack Definition A young pike; a pickerel.
  • English Word Jack Definition The jurel.
  • English Word Jack Definition A large, California rock fish (Sebastodes paucispinus); -- called also boccaccio, and merou.
  • English Word Jack Definition The wall-eyed pike.
  • English Word Jack Definition A drinking measure holding half a pint; also, one holding a quarter of a pint.
  • English Word Jack Definition 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.
  • English Word Jack Definition 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.
  • English Word Jack Definition The knave of a suit of playing cards.
  • English Word Jack Definition A coarse and cheap mediaeval coat of defense, esp. one made of leather.
  • English Word Jack Definition A pitcher or can of waxed leather; -- called also black jack.
  • English Word Jack Definition To hunt game at night by means of a jack. See 2d Jack, n., 4, n.
  • English Word Jack Definition To move or lift, as a house, by means of a jack or jacks. See 2d Jack, n., 5.
  • English Word Jack Ketch Definition A public executioner, or hangman.