English definition of Jack

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Definition of jack

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"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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Jack :: "Jack (n.) A hood or other device placed over a chimney or vent pipe, to prevent a back draught..

Acton :: Acton (n.) A stuffed jacket worn under the mail, or (later) a jacket plated with mail..

Jack :: "Jack (n.) An impertinent or silly fellow; a simpleton; a boor; a clown; also, a servant; a rustic..

Kadder :: Kadder (n.) The jackdaw.

Jackwood :: "Jackwood (n.) Wood of the jack (Artocarpus integrifolia), used in cabinetwork..

Strake :: Strait-waistcoat (n.) Same as Strait-jacket.

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..

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

Jak :: Jak (n.) see Ils Jack.

Jack :: Jack (n.) A sawhorse or sawbuck.

Jacksaw :: Jacksaw (n.) The merganser.

Skipjack :: Skipjack (n.) An upstart.

Sphalerite :: Sphalerite (n.) Zinc sulphide; -- called also blende, black-jack, false galena, etc. See Blende (a)..

Chuck :: Chuck (n.) A game played with chucks, in which one or more are tossed up and caught; jackstones..

Jacketing :: "Jacketing (n.) The material of a jacket; as, nonconducting jacketing..

Cestraciont :: Cestraciont (n.) A shark of the genus Cestracion, and of related genera. The posterior teeth form a pavement of bony plates for crushing shellfish. Most of the species are extinct. The Port Jackson shark and a similar one found in California are living examples..

Grasshopper :: Grasshopper (n.) In ordinary square or upright pianos of London make, the escapement lever or jack, so made that it can be taken out and replaced with the key; -- called also the hopper..

Crossjack :: Crossjack (n.) The lowest square sail, or the lower yard of the mizzenmast..

Bootjack :: Bootjack (n.) A device for pulling off boots.

Black-jack :: Black-jack (n.) A name given by English miners to sphalerite, or zinc blende; -- called also false galena. See Blende..