[n] a short coat
[n] an outer wrapping or casing; "phonograph records were sold in cardboard jackets"
[n] the tough metal shell casing for certain kinds of ammunition
[n] (dentistry) an artificial crown fitted over a broken or decayed tooth
[n] the outer skin of a potato
[v] put a jacket on
[v] provide with a thermally non-conducting cover; "The tubing needs to be jacketed"