JACKET

vt to put a jacket on; to furnish, as a boiler, with a jacket.

2. jacket ·vt to thrash; to beat.

3. jacket ·noun a short upper garment, extending downward to the hips; a short coat without skirts.

4. jacket ·noun in ordnance, a strengthening band surrounding and reenforcing the tube in which the charge is fired.

5. jacket ·noun a garment resembling a waistcoat lined with cork, to serve as a life preserver;

— called also cork jacket.

6. jacket ·noun an outer covering for anything, ·esp. a covering of some nonconducting material such as wood or felt, used to prevent radiation of heat, as from a steam boiler, cylinder, pipe, ·etc.