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jack off (vulgar slang) to masturbate.
jack-o'-lantern a traditional Halloween lamp made from a pumpkin by removing the pulp, carving a face through the shell, and placing a candle in the bottom.
jack pine an evergreen tree of Canada and the northern United States, having short twisted needles in pairs, woody cones, and soft wood used for paper.
jackpot stakes that accumulate until they are won, esp. in poker. [2 definitions]
jack rabbit any of several large hares found in the western United States, characterized by long ears and very long, strong hind legs.
jackscrew a jack in which the lifting surface is threaded on and operated by a vertical screw.
jacksnipe a small short-billed snipe of Europe and Asia. [2 definitions]
Jackson the capital of Mississippi.
jackstay a rope or rod along a ship's yard, gaff, or boom to which one edge of a sail is fastened. [3 definitions]
jackstone any of the small stones or metal pieces used in playing jacks.
jackstraws (used with a sing. verb) a game in which straws or thin strips are tossed into a heap and each player picks up as many as possible without moving the rest.
jack-tar a sailor.
Jacob according to the Old Testament, the son of Isaac and grandson of Abraham from whose sons the twelve tribes of Israel descended; Israel.
Jacobin a member of a society of radical democrats that used terrorist tactics during the French Revolution. [3 definitions]
Jacobite a supporter of James II of England or of the Stuart claimants to the throne following 1688.
Jacob's ladder in the Bible, a ladder from earth to heaven seen by Jacob in a dream. [3 definitions]
Jacquard a loom used for weaving elaborate designs; Jacquard loom. [2 definitions]
jactitation in law, a false boast or claim that causes harm to another. [2 definitions]
Jacuzzi trademark for a type of bath equipped with air jets that create a whirlpool effect.
jade1 one of two hard, translucent, usu. green minerals, nephrite or jadeite, or the carved and polished jewelry or decorative objects made from them. [2 definitions]
jade2 an old, worthless, or ill-tempered horse; nag. [3 definitions]