Definition of Jack

Pronunciation: jăk
n.1.(Bot.) A large tree, the Artocarpus integrifolia, common in the East Indies, closely allied to the breadfruit, from which it differs in having its leaves entire. The fruit is of great size, weighing from thirty to forty pounds, and through its soft fibrous matter are scattered the seeds, which are roasted and eaten. The wood is of a yellow color, fine grain, and rather heavy, and is much used in cabinetwork. It is also used for dyeing a brilliant yellow.
1.A familiar nickname of, or substitute for, John.
You are John Rugby, and you are Jack Rugby.
- Shak.
2.An impertinent or silly fellow; a simpleton; a boor; a clown; also, a servant; a rustic.
Since every Jack became a gentleman,
There 's many a gentle person made a Jack.
- Shak.
3.A popular colloquial name for a sailor; - called also Jack tar, and Jack afloat.
4.(Mining) 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
5.A portable machine variously constructed, for exerting great pressure, or lifting or moving a heavy body such as an automobile 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.
6.The small bowl used as a mark in the game of bowls.
Like an uninstructed bowler who thinks to attain the jack by delivering his bowl straight forward upon it.
- Sir W. Scott.
7.The male of certain animals, as of the ass.
8.(Zool.) A young pike; a pickerel.
9.A drinking measure holding half a pint; also, one holding a quarter of a pint.
10.(Naut.) A flag, containing only the union, without the fly, usually hoisted on a jack staff at the bowsprit cap; - called also union jack. The American jack is a small blue flag, with a star for each State.
11.The knave of a suit of playing cards.
12.A game played with small (metallic, with tetrahedrally oriented spikes) objects (the jacks(1950+), formerly jackstones) that are tossed, caught, picked up, and arranged on a horizontal surface in various patterns; in the modern American game, the movements are accompanied by tossing or bouncing a rubber ball on the horizontal surface supporting the jacks. same as jackstones.
14.Apple jack.
Jack arch
an arch of the thickness of one brick.
Jack back
(Brewing & Malt Vinegar Manuf.) a cistern which receives the wort. See under 1st Back.
Jack block
(Naut.) a block fixed in the topgallant or royal rigging, used for raising and lowering light masts and spars.
Jack boots
boots reaching above the knee; - worn in the 17 century by soldiers; afterwards by fishermen, etc.
Jack crosstree
(Naut.) See 10, b, above.
Jack curlew
(Zool.) the whimbrel.
Jack frame
g - (Cotton Spinning) See 4 (g), above.
Jack Frost
frost or cold weather personified as a mischievous person.
Jack hare
a male hare.
Jack lamp
a lamp for still hunting and camp use. See def. 4 (n.), above.
- Cowper.
Jack plane
a joiner's plane used for coarse work.
Jack post
one of the posts which support the crank shaft of a deep-well-boring apparatus.
Jack pot
(Poker Playing) the name given to the stakes, contributions to which are made by each player successively, till such a hand is turned as shall take the "pot," which is the sum total of all the bets. See also jackpot.
Jack rabbit
(Zool.) any one of several species of large American hares, having very large ears and long legs. The California species (Lepus Californicus), and that of Texas and New Mexico (Lepus callotis), have the tail black above, and the ears black at the tip. They do not become white in winter. The more northern prairie hare (Lepus campestris) has the upper side of the tail white, and in winter its fur becomes nearly white.
Jack rafter
(Arch.) in England, one of the shorter rafters used in constructing a hip or valley roof; in the United States, any secondary roof timber, as the common rafters resting on purlins in a trussed roof; also, one of the pieces simulating extended rafters, used under the eaves in some styles of building.
Jack salmon
(Zool.) the wall-eyed pike, or glasseye.
Jack sauce
an impudent fellow.
Jack shaft
(Mach.) the first intermediate shaft, in a factory or mill, which receives power, through belts or gearing, from a prime mover, and transmits it, by the same means, to other intermediate shafts or to a line shaft.
Jack sinker
(Knitting Mach.) a thin iron plate operated by the jack to depress the loop of thread between two needles.
Jack snipe
(Zool.) See in the Vocabulary.
Jack staff
(Naut.) a staff fixed on the bowsprit cap, upon which the jack is hoisted.
Jack timber
(Arch.) any timber, as a rafter, rib, or studding, which, being intercepted, is shorter than the others.
Jack towel
a towel hung on a roller for common use.
Jack truss
(Arch.) in a hip roof, a minor truss used where the roof has not its full section.
Jack tree
(Bot.) See 1st Jack, n.
Jack yard
(Naut.) a short spar to extend a topsail beyond the gaff.
Blue jack
blue vitriol; sulphate of copper.
Hydraulic jack
a jack used for lifting, pulling, or forcing, consisting of a compact portable hydrostatic press, with its pump and a reservoir containing a supply of liquid, as oil.
a - One called upon to take the place of another in an emergency
b - An itinerant parson who conducts an occasional service for a fee.
one who can turn his hand to any kind of work.
(Bot.) a plant of the genus Erysimum (Erysimum alliaria, or Alliaria officinalis), which grows under hedges. It bears a white flower and has a taste not unlike garlic. Called also, in England, sauce-alone.
an insolent fellow in authority.
- Eng. Cyc.
(Bot.) a tropical shrub with red fruit (Cordia Cylindrostachya).
- Wolcott.
a chimney sweep inclosed in a framework of boughs, carried in Mayday processions.
(Bot.) the stonecrop (Sedum acre).
a figure, usually of a man, on old clocks, which struck the time on the bell.
one who is or tries to be neutral.
one who has been in office and is turned out.
Jack the Giant Killer
the hero of a well-known nursery story.
- Shak.
Yellow Jack
(Naut.) the yellow fever; also, the quarantine flag. See Yellow flag, under Flag.
1.A coarse and cheap mediæval coat of defense, esp. one made of leather.
Their horsemen are with jacks for most part clad.
- Sir J. Harrington.
1.A pitcher or can of waxed leather; - called also black jack.
v. i.1.To hunt game at night by means of a jack. See 2d Jack, n., 4, n.
v. t.1.To move or lift, as a house, by means of a jack or jacks. See 2d Jack, n., 5.

Related Words

AB, Ancient Mariner, Argonaut, Dannebrog, Dylan, Flying Dutchman, Jolly Roger, Neptune, OD, Old Glory, Poseidon, Rocky Mountain canary, Star-Spangled Banner, Stars and Stripes, Union Flag, Union Jack, Varuna, able seaman, able-bodied seaman, ace, and blue, ass, baluster, balustrade, banderole, banister, banner, banneret, base, best bower, black flag, blue ensign, bluejacket, blunt, boodle, bower, brass, bread, buccaneer, bucks, bunting, burgee, burro, cabbage, cards, caryatid, cash, chips, clubs, coachwhip, coin, colonnade, color, colors, column, crab, crane, cuddy, dado, deck, deep-sea man, derrick, deuce, diamonds, dickey, die, dinero, donkey, dough, dummy, ensign, erector, face cards, fair-weather sailor, fisherman, flag, flush, footstalk, forklift, full house, gantry crane, gelt, gilt, gonfalon, gonfanon, grease, green, green stuff, greenbacks, guidon, hand, hearts, hearty, hoist, house flag, hydraulic tailgate, jack afloat, jack-tar, jackass, jackscrew, jacky, jennet, jenny, jenny ass, joker, kale, king, knave, left bower, lever, lift, lifter, limey, lobsterman, long pennant, mariner, matelot, mazuma, merchant flag, money, moolah, mopus, national flag, navigator, neddy, newel-post, oil of palms, ointment, oof, ooftish, oriflamme, pack, pair, pedestal, pedicel, peduncle, pendant, pennant, pennon, pennoncel, picture cards, pier, pilaster, pile, piling, pillar, pirate, playing cards, plinth, pole, post, privateer, queen, queen-post, red, red ensign, rhino, rocks, round, royal flush, royal standard, rubber, ruff, sailor, salt, scratch, sea dog, sea rover, seafarer, seafaring man, seaman, shaft, shekels, shipman, signal flag, simoleons, singleton, socle, spades, spondulics, staff, stalk, stanchion, stand, standard, stem, straight, streamer, subbase, sugar, surbase, swallowtail, tackle, tar, tarpaulin, the needful, tin, trey, trick, tricolor, trump, trunk, upright, vexillum, viking, wampum, water dog, whaler, white, windjammer, windlass, windsailor


Jablockoff candle
Jack arch
Jack back
Jack block
Jack boots
Jack crosstree
Jack curlew
Jack frame
Jack Frost
Jack hare
Jack Ketch
Jack lamp
jack pins
Jack plane
Jack post
Jack pot
Jack rabbit
Jack rafter
Jack salmon
Jack sauce
Jack shaft
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