Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for jack from the 1913 edition of Webster's Revised Unabridged Dictionary. Define jack using one of the most comprehensive free online dictionaries on the web.

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jack
Part of Speech: noun
Results: 32
1. A familiar nickname of, or substitute for, John.
3. 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
4. A device to pull off boots.
6. A machine or contrivance for turning a spit; a smoke jack, or kitchen jack.
8. A lever for depressing the sinkers which push the loops down on the needles.
9. A grating to separate and guide the threads; a heck box.
11. A compact, portable machine for planing metal.
13. A system of gearing driven by a horse power, for multiplying speed.
17. The male of certain animals, as of the ass.
18. A young pike; a pickerel.
19. The jurel.
20. The wall- eyed pike.
22. The knave of a suit of playing cards.
24. A popular colloquial name for a sailor; - called also tar, and afloat.
26. A large, California rock fish ( Sebastodes paucispinus); - called also boccaccio, and merou.
27. 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.
28. 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.
29. A pitcher or can of waxed leather; - called also black jack.
Part of Speech: verb
1. To hunt game at night by means of a jack. See 2d Jack, n., 4, n.
Part of Speech: verb transitive
1. To move or lift, as a house, by means of a jack or jacks. See 2d Jack, n., 5.
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