jacket

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A short coat usually extending to the hips.
• noun An outer covering or casing, especially.
• noun The skin of a potato.
• noun The dust jacket of a book or phonograph record.
• noun An insulation covering for a steam pipe, wire, boiler, or similar part.
• noun An open envelope or folder for filing papers.
• noun The outer metal shell or case of a bullet.
• transitive verb To supply or cover with a jacket.

from The Century Dictionary.

• To cover with or inclose in a jacket: as, to jacket a steam-cylinder, etc.; to jacket a document. See jacket, n., 5 and 6.
• To beat; thrash.
• noun The loose wrapper of paper which protects the binding of a book.
• noun The sheet of cardboard or thick paper which covers the impression surface of a printing-cylinder.
• noun The hide or other natural covering of various animals, as sheep, seals, fish, etc.
• noun The skin of a potato.
• noun A light jack: a garment having but slight value as a defense against weapons.
• noun A short coat or body-garment; any garment for the body coming not lower than the hips.
• noun A waistcoat or vest.
• noun Something designed to be fastened about or cover the body for some other purpose than that of clothing: as, a strait-jacket, or a swimming-jacket.
• noun Clothing or covering placed around a cylindrical or other vessel of any kind, as a pipe, a cannon, a steam-boiler, a smokestack where it passes through the deck, etc., to give greater power of resistance, to prevent escape of heat by radiation, etc.
• noun A folded paper or open envelop containing an official document, on which is indorsed an order or other direction respecting the disposition to be made of the document, memoranda respecting its contents, dates of reception and transmission, etc.
• noun A young seal: so called from the rough fur.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To put a jacket on; to furnish, as a boiler, with a jacket.
• transitive verb Low To thrash; to beat.
• noun A short upper garment, extending downward to the hips; a short coat without skirts.
• 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.
• noun (Mil.) In ordnance, a strengthening band surrounding and reënforcing the tube in which the charge is fired.
• noun A garment resembling a waistcoat lined with cork, to serve as a life preserver; -- called also cork jacket.
• noun (Naut.) See under Blue.
• noun a space filled with steam between an inner and an outer cylinder, or between a casing and a receptacle, as a kettle.
• noun [Colloq.] to give one a beating.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.
• noun A piece of a person suit, beside trousers and, sometimes, waistcoat ; coat (US)
• noun A removable or replaceable protective or insulating cover for an object (eg a book, hot water tank.)
• noun slang A police record.
• verb transitive To enclose or encase in a jacket or other covering.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb provide with a thermally non-conducting cover
• noun the outer skin of a potato
• verb put a jacket on
• noun a short coat
• noun the tough metal shell casing for certain kinds of ammunition
• noun (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
• noun an outer wrapping or casing