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Jack

Definition: 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.

Jack

Definition: A familiar nickname of, or substitute for, John.

Jack

Definition: An impertinent or silly fellow; a simpleton; a boor; a clown;
also, a servant; a rustic.

Jack

Definition: A popular colloquial name for a sailor; -- called also Jack
tar, and Jack afloat.

Jack

Definition: 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

Jack

Definition: A device to pull off boots.

Jack

Definition: A sawhorse or sawbuck.

Jack

Definition: A machine or contrivance for turning a spit; a smoke jack, or
kitchen jack.

Jack

Definition: A wooden wedge for separating rocks rent by blasting.

Jack

Definition: A lever for depressing the sinkers which push the loops down
on the needles.

Jack

Definition: A grating to separate and guide the threads; a heck box.

Jack

Definition: A machine for twisting the sliver as it leaves the carding
machine.

Jack

Definition: A compact, portable machine for planing metal.

Jack

Definition: A machine for slicking or pebbling leather.

Jack

Definition: A system of gearing driven by a horse power, for multiplying
speed.

Jack

Definition: A hood or other device placed over a chimney or vent pipe, to
prevent a back draught.

Jack

Definition: In the harpsichord, an intermediate piece communicating the
action of the key to the quill; -- called also hopper.

Jack

Definition: In hunting, the pan or frame holding the fuel of the torch
used to attract game at night; also, the light itself.

Jack

Definition: 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.

Jack

Definition: The small bowl used as a mark in the game of bowls.

Jack

Definition: The male of certain animals, as of the ass.

Jack

Definition: A young pike; a pickerel.

Jack

Definition: The jurel.

Jack

Definition: A large, California rock fish (Sebastodes paucispinus); --
called also boccaccio, and merou.

Jack

Definition: The wall-eyed pike.

Jack

Definition: A drinking measure holding half a pint; also, one holding a
quarter of a pint.

Jack

Definition: 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.

Jack

Definition: A bar of iron athwart ships at a topgallant masthead, to
support a royal mast, and give spread to the royal shrouds; -- called
also jack crosstree.

Jack

Definition: The knave of a suit of playing cards.

Jack

Definition: A coarse and cheap mediaeval coat of defense, esp. one made
of leather.

Jack

Definition: A pitcher or can of waxed leather; -- called also black jack.

Jack

Definition: To hunt game at night by means of a jack. See 2d Jack, n.,
4, n.

Jack

Definition: To move or lift, as a house, by means of a jack or jacks.
See 2d Jack, n., 5.