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