Definition of jack

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"Jack (n.) A system of gearing driven by a horse power, for multiplying speed..

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Skipjack :: Skipjack (n.) An upstart.
Plane :: Plane (a.) A tool for smoothing boards or other surfaces of wood, for forming moldings, etc. It consists of a smooth-soled stock, usually of wood, from the under side or face of which projects slightly the steel cutting edge of a chisel, called the iron, which inclines backward, with an apperture in front for the escape of shavings; as, the jack plane; the smoothing plane; the molding plane, etc..
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..
Acton :: Acton (n.) A stuffed jacket worn under the mail, or (later) a jacket plated with mail..
Skipjack :: Skipjack (n.) A name given to several kinds of a fish, as the common bluefish, the alewife, the bonito, the butterfish, the cutlass fish, the jurel, the leather jacket, the runner, the saurel, the saury, the threadfish, etc..
Jacksaw :: Jacksaw (n.) The merganser.
Jackstone :: Jackstone (n.) A game played with five small stones or pieces of metal. See 6th Chuck.
Horse :: Horse (a.) A jackstay.
Liner :: Liner (n.) A lining within the cylinder, in which the piston works and between which and the outer shell of the cylinder a space is left to form a steam jacket..
Merou :: Merou (n.) See Jack, 8 (c)..
Jacksnipe :: "Jacksnipe (n.) A small American sandpiper (Tringa maculata); -- called also pectoral sandpiper, and grass snipe..
Jack :: "Jack (n.) A hood or other device placed over a chimney or vent pipe, to prevent a back draught..
Garibaldi :: Garibaldi (n.) A jacket worn by women; -- so called from its resemblance in shape to the red shirt worn by the Italians patriot Garibaldi.
Varlet :: Varlet (n.) In a pack of playing cards, the court card now called the knave, or jack..
Black-jack :: Black-jack (n.) Caramel or burnt sugar, used to color wines, spirits, ground coffee, etc..
Jack-a-dandy :: "Jack-a-dandy (n.) A little dandy; a little, foppish, impertinent fellow..
Bonito :: Bonito (n.) The skipjack (Sarda Mediterranea) of the Atlantic, an important and abundant food fish on the coast of the United States, and (S. Chilensis) of the Pacific, and other related species. They are large and active fishes, of a blue color with black oblique stripes..
Jurel :: "Jurel (n.) A yellow carangoid fish of the Atlantic and Gulf coasts (Caranx chrysos), most abundant southward, where it is valued as a food fish; -- called also hardtail, horse crevalle, jack, buffalo jack, skipjack, yellow mackerel, and sometimes, improperly, horse mackerel. Other species of Caranx (as C. fallax) are also sometimes called jurel..
Jack :: Jack (n.) The small bowl used as a mark in the game of bowls.
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..
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