Definition of jack

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"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.

Lern More About Jack

Black-jack :: Black-jack (n.) A name given by English miners to sphalerite, or zinc blende; -- called also false galena. See Blende..
Jacket :: "Jacket (n.) In ordnance, a strengthening band surrounding and reenforcing the tube in which the charge is fired..
Jackstay :: "Jackstay (n.) A rail of wood or iron stretching along a yard of a vessel, to which the sails are fastened..
Ketch :: Ketch (n.) A hangman. See Jack Ketch.
Crossjack :: Crossjack (n.) The lowest square sail, or the lower yard of the mizzenmast..
Triddler :: Triddler (n.) The jacksnipe.
Jacket :: "Jacket (n.) A short upper garment, extending downward to the hips; a short coat without skirts..
Flapjack :: Flapjack (n.) A fklat cake turned on the griddle while cooking; a griddlecake or pacake.
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..
Jackmen :: Jackmen (pl. ) of Jackma.
Jackslave :: Jackslave (n.) A low servant; a mean fellow.
Jacksnipe :: "Jacksnipe (n.) A small American sandpiper (Tringa maculata); -- called also pectoral sandpiper, and grass snipe..
Jackass :: Jackass (n.) A conceited dolt; a perverse blockhead.
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..
Jackwood :: "Jackwood (n.) Wood of the jack (Artocarpus integrifolia), used in cabinetwork..
Cheap-jack :: Cheap-jack (n.) Alt. of Cheap-joh.
Jack :: "Jack (n.) A machine or contrivance for turning a spit; a smoke jack, or kitchen jack..
Sweater :: Sweater (n.) A woolen jacket or jersey worn by athletes.
Daw :: Daw (n.) A European bird of the Crow family (Corvus monedula), often nesting in church towers and ruins; a jackdaw..
Jack :: "Jack (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..
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