What is meaning of jacket?

Answer 1

A short upper garment, extending downward to the hips; a short coat without skirts., 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., In ordnance, a strengthening band surrounding and reenforcing the tube in which the charge is fired., A garment resembling a waistcoat lined with cork, to serve as a life preserver; -- called also cork jacket., To put a jacket on; to furnish, as a boiler, with a jacket., To thrash; to beat.