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Definition of jacket:

  1. A garment resembling a waistcoat lined with cork, to serve as a life preserver; - called also cork jacket.
  2. A short upper garment, extending downward to the hips; a short coat without skirts.
  3. 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.
  4. In ordnance, a strengthening band surrounding and reenforcing the tube in which the charge is fired.
  5. To put a jacket on; to furnish, as a boiler, with a jacket.
  6. To thrash; to beat.


crown, surface, cap, chapiter, fell, pate, pileus, detonating device, top, diadem, treetop, crest, peak, crownwork, capital, poll, pennant, summit, tip, jacket crown, roof, detonator, hide, ceiling, hood, pelt.

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