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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Sola :: Sola (n.) A leguminous plant (Aeschynomene aspera) growing in moist places in Southern India and the East Indies. Its pithlike stem is used for making hats, swimming-jackets, etc..

Whimbrel :: Whimbrel (n.) Any one of several species of small curlews, especially the European species (Numenius phaeopus), called also Jack curlew, half curlew, stone curlew, and tang whaup. See Illustration in Appendix..

Jackass :: Jackass (n.) The male ass; a donkey.

Grego :: Grego (n.) A short jacket or cloak, made of very thick, coarse cloth, with a hood attached, worn by the Greeks and others in the Levant..

Jack :: Jack (n.) A pitcher or can of waxed leather; -- called also black jack.

Jack-o''-lantern :: "Jack-o'-lantern (n.) See Jack-with-a-lantern, under 2d 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..

Jack :: "Jack (n.) The male of certain animals, as of the ass..

Jackass :: Jackass (n.) A conceited dolt; a perverse blockhead.

Spinet :: Spinet (n.) A keyed instrument of music resembling a harpsichord, but smaller, with one string of brass or steel wire to each note, sounded by means of leather or quill plectrums or jacks. It was formerly much used..

Minute-jack :: Minute-jack (n.) A timeserver; an inconstant person.

Jack :: Jack (n.) The knave of a suit of playing cards.

Jackscrew :: "Jackscrew (n.) A jack in which a screw is used for lifting, or exerting pressure. See Illust. of 2d Jack, n., 5..

Sauce-alone :: Sauce-alone (n.) Jack-by-the-hedge. See under Jack.

Tomcod :: Tomcod (n.) The jack. See 2d Jack, 8. (c)..

Jack :: "Jack (n.) A machine or contrivance for turning a spit; a smoke jack, or kitchen jack..

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..

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..

Jigger :: "Jigger (n.) A pendulum rolling machine for slicking or graining leather; same as Jack, 4 (i)..

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