Webster's English Dictionary

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jacket

1. jack.et \'jak-*t\ \-*t-*d\ n [ME jaket, fr. MF jaquet, dim. of jaque 
   short jacket, fr. ]jacque peasant, fr. the name Jacques James 1a: a garment 
   for the upper body usu. having a front opening, collar, lapel s, sleeves, 
   and pockets 1b: something worn or fastened around the body but not for use 
   as clothing  2a1: the natural covering of an animal  2a2: the fur or wool 
   of a mammal  2b: the skin of a potato  3: an outer covering or casing : as  
   3a1: a thermally nonconducting cover  3a2: a covering that encloses an 
   intermediate space through which a tempera ture-controlling fluid 
   circulates 3a3: a tough cold-worked metal casing that forms the outer shell 
   of a built -up bullet 3b1: a wrapper or open envelope for a document  3b2: 
   an envelope for enclosing registered mail during delivery from one pos t 
   office to another 3c1: a detachable protective wrapper for a book  3c2: the 
   cover of a paperback book  3c3: the outside leaves for a booklet, pamphlet, 
   or catalog that is to be s titched or wired through the saddle 3c4: a paper 
   or paperboard envelope for a phonograph record  - jack.et.ed aj
2. jacket vt : to put a jacket on