jack

1. n. 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. Source: opted

2. n. A familiar nickname of, or substitute for, John. Source: opted

3. n. An impertinent or silly fellow; a simpleton; a boor; a clown; also, a servant; a rustic. Source: opted

4. n. A popular colloquial name for a sailor; -- called also Jack tar, and Jack afloat. Source: opted

5. n. 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 Source: opted

6. n. A device to pull off boots. Source: opted

7. n. A sawhorse or sawbuck. Source: opted

8. n. A machine or contrivance for turning a spit; a smoke jack, or kitchen jack. Source: opted

9. n. A wooden wedge for separating rocks rent by blasting. Source: opted

10. n. A lever for depressing the sinkers which push the loops down on the needles. Source: opted

11. n. A grating to separate and guide the threads; a heck box. Source: opted

12. n. A machine for twisting the sliver as it leaves the carding machine. Source: opted

13. n. A compact, portable machine for planing metal. Source: opted

14. n. A machine for slicking or pebbling leather. Source: opted

15. n. A system of gearing driven by a horse power, for multiplying speed. Source: opted

16. n. A hood or other device placed over a chimney or vent pipe, to prevent a back draught. Source: opted

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

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

19. 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. Source: opted

20. n. The small bowl used as a mark in the game of bowls. Source: opted

21. n. The male of certain animals, as of the ass. Source: opted

22. n. A young pike; a pickerel. Source: opted

23. n. The jurel. Source: opted

24. n. A large, California rock fish (Sebastodes paucispinus); -- called also boccaccio, and merou. Source: opted

25. n. The wall-eyed pike. Source: opted

26. n. A drinking measure holding half a pint; also, one holding a quarter of a pint. Source: opted

27. n. 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. Source: opted

28. n. 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. Source: opted

29. n. The knave of a suit of playing cards. Source: opted

30. n. A coarse and cheap mediaeval coat of defense, esp. one made of leather. Source: opted

31. n. A pitcher or can of waxed leather; -- called also black jack. Source: opted

32. v. i. To hunt game at night by means of a jack. See 2d Jack, n., 4, n. Source: opted

33. v. t. To move or lift, as a house, by means of a jack or jacks. See 2d Jack, n., 5. Source: opted

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