jacket

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

provide with a thermally non-conducting cover; "The tubing needs to be jacketed"

put a jacket on; "The men were jacketed"