n. [capitalized] An abbreviation or diminutive of the name Jacob, now regarded as a nickname or diminutive of the name John.n. A young man; a fellow: used with jill, a young woman, both being commonly treated as proper names.n. [cap, or lowercase] A saucy or impertinent fellow; an upstart; a coxcomb; a jackanapes; a sham gentleman: as, jack lord, jack gentleman, jack meddler, and similar combinations.n. [capitalized] A familiar term of address used among sailors, soldiers, laborers, etc.; hence, in popular use (commonly Jack Tar), a sailor.n. Same as jack in the water (which see, below).n. [lowercase or cap.] A figure which strikes the bell in clocks: also called jack of the clock or clock-house: as, the two jacks of St. Dunstan's.n. Any one of the knaves in a pack of playing-cards.n. The male of certain animals; specifically, a male ass; especially, an ass kept for getting mules from mares; a jackass.n. A name of several different fishes.n. A percoid fish, Stizostedium vitreum, the pike-perch.n. A scorpænoid fish. Sebastichthys or Sebastodes paucispinis, better known as boccaccio.n. One of several caran-goid fishes, especially Caranx pisquetos, also called buffalo-jack, hickory-jack, and jack-fish; also, Seriola carolinensis.n. The pampano, Trachynotus carolinus.n. The jackdaw, Corvus monedula.n. The jack-curlew, Numenius hudsonius.n. A kind of pigeon; a jacobin.n. One of various convenient implements or mechanical contrivances obviating the need of an assistant: used alone or compounded with some other word designating the special purpose of the implement or some other distinguishing circumstance: as, a pegging-jack; a shackle-jack, or thill-jack. n. A rock-lever or oscillating lever. Such levers are used in stocking-frames, in knitting-machines, and in other machinery. Their function is the actuation of other moving parts to produce specific results at proper periods.n. In spinning, a bobbin and frame operating on the sliver from the carding-machine and passing the product to the roving-machine.n. In weaving, same as heck-box.n. In the harpsichord, clavichord, pianoforte, and similar instruments, an upright piece of wood at the inner or rear end of each key or digital, designed to bring the motion of the latter to bear upon the string. In the harpsichord and spinet the jack carries a quill or spine by which the string is twanged; in the clavichord it terminates in a metal tangent by which the string is pressed; and in the pianoforte it merely transmits the motion of the key to the hammer.n. A wooden frame on which wood is sawed; a sawbuck or sawhorse.n. In mining: A wooden wedge used to split rocks after blasting; a gad. A kind of water-engine, turned by hand, for use in mines.n. A portable cresset or fire-pan used for hunting or fishing at night. Also called jack-lamp, jack lantern, jack-lightn. A tin case in which the safety-lamp is carried by coalminers in places where the current of air is very strong.n. In telegraphy and teleph, a terminal consisting of a spring-clip, by means of which instruments can be expeditiously introduced into the circuit. In telephones such terminals are sometimes used at exchanges for allowing the lines of different subscribers to be quickly connected. The connection is made by means of a wire cord on the ends of which are metallic wedges covered on one side with insulating material. These wedges, called jack-knives or simply jacks, are inserted into the terminals of the lines to be connected. Also called spring-jack.n. A pitcher, formerly of waxed leather, afterward of tin or other metal; a black-jack.n. A half-pint; also, a quarter of a pint.n. In the game of bowls, an odd bowl thrown out for a mark to the players.n. A flag showing the union only: used by those nations whose national standard contains a union, as Great Britain and the United States.n. A horizontal bar or crosstree of iron at the topgallantmast-head, to spread the royal-shrouds. Also called jack-crosstree.n. A kind of schooner-rigged vessel of from 10 to 25 tons, used in the Newfoundland fisheries.n. [capitalized] A Jacobite. [Cant.] In the quotation it is used with a punning reference to the flag. See def. 15.n. A farthing.n. A card-counter.n. A seal. Also jark, [Old slang.]n. The hickory-shad, Pomolobus mediocris.n. [It is sometimes explained as the fish called sole, and sometimes as a dish warmed up a second time.]To operate on with a jack; lift with a jack.To hunt with a jack. See jack, n., 11 .To use a jack in hunting or fishing; seek or find game by means of a jack.n. A coat of fence of cheap make worn by foot-soldiers, yeomen, and the like.n. Same as jack-tree.n. The fruit of the jack-tree: same as jackfruit.See jack-tree.n. A Jacqueminot rose. Also Jacque.n. n. n. Same as black-jack. 3.n. The jonquil, Narcissus jonquilla.In leather manufacturing, to roll by means of a roller attached to an arm.
