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n. 1. A short coat usually extending to the hips. 2. An outer covering or casing, especially: a. The skin of a potato. b. The dust jacket of a book or phonograph record. c. An insulation covering for a steam pipe, wire, boiler, or similar part. d. An open envelope or folder for filing papers. e. The outer metal shell or case of a bullet. 3. A piece of jewelry or other ornament that attaches to an earring stud. tr.v. jack·et·ed, jack·et·ing, jack·ets To supply or cover with a jacket. [Middle English jaket, from Old French jaquet, diminutive of jaque, short jacket, tunic, from jacques, nickname for French peasants, from the name Jacques; see JACK.] jacket·ed adj. |
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