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.
TRANSITIVE VERB:
Inflected forms: jack·et·ed, jack·et·ing, jack·ets To supply or cover with a jacket.
ETYMOLOGY:
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) or from Old Catalan jaco (perhaps from Arabic akk, mailcoat).
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akk, mailcoat).
