jacket
noun
a short coat
an outer wrapping or casing
“phonograph records were sold in cardboard jackets”
(dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
“tomorrow my dentist will fit me for a crown”
the outer skin of a potato
the tough metal shell casing for certain kinds of ammunition
verb
provide with a thermally non-conducting cover
“The tubing needs to be jacketed”
put a jacket on
“The men were jacketed”
Source: WordNet 3.1, Princeton University