Definition of jack

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"Jack (n.) A familiar nickname of, or substitute for, John..

Lern More About Jack

Supplely :: Supple-jack (n.) A somewhat similar tropical American plant (Paullinia Curassavica); also, a walking stick made from its stem..
Sweater :: Sweater (n.) A woolen jacket or jersey worn by athletes.
Truss :: Truss (n.) A padded jacket or dress worn under armor, to protect the body from the effects of friction; also, a part of a woman's dress; a stomacher..
Juddock :: Juddock (n.) See Jacksnipe.
Crick :: Crick (n.) A small jackscrew.
Ignis Fatuus :: Ignis fatuus () A phosphorescent light that appears, in the night, over marshy ground, supposed to be occasioned by the decomposition of animal or vegetable substances, or by some inflammable gas; -- popularly called also Will-with-the-wisp, or Will-o'-the-wisp, and Jack-with-a-lantern, or Jack-o'-lantern..
Jack :: "Jack (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.
Air Jacket :: Air jacket () A jacket having air-tight cells, or cavities which can be filled with air, to render persons buoyant in swimming..
Tomcod :: Tomcod (n.) The jack. See 2d Jack, 8. (c)..
Jigger :: "Jigger (n.) A pendulum rolling machine for slicking or graining leather; same as Jack, 4 (i)..
Roundabout :: Roundabout (n.) A short, close jacket worn by boys, sailors, etc..
Jane-of-apes :: "Jane-of-apes (n.) A silly, pert girl; -- corresponding to jackanapes..
Jack :: Jack (n.) The jurel.
Crossjack :: Crossjack (n.) The lowest square sail, or the lower yard of the mizzenmast..
Jackman :: Jackman (n.) A cream cheese.
Straight :: Straight (superl.) Composed of cards which constitute a regular sequence, as the ace, king, queen, jack, and ten-spot; as, a straight hand; a straight flush..
Jacket :: "Jacket (n.) In ordnance, a strengthening band surrounding and reenforcing the tube in which the charge is fired..
Jersey :: "Jersey (n.) A kind of knitted jacket; hence, in general, a closefitting jacket or upper garment made of an elastic fabric (as stockinet)..
Jack :: "Jack (v. t.) To move or lift, as a house, by means of a jack or jacks. See 2d Jack, n., 5..
Jack :: "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..
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