jacket

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A short coat usually extending to the hips.
2. n. An outer covering or casing, especially:
3. n. The skin of a potato.
4. n. The dust jacket of a book or phonograph record.
5. n. An insulation covering for a steam pipe, wire, boiler, or similar part.
6. n. An open envelope or folder for filing papers.
7. n. The outer metal shell or case of a bullet.
8. v. To supply or cover with a jacket.

Century Dictionary and Cyclopedia

1. n. A light jack: a garment having but slight value as a defense against weapons.
2. n. A short coat or body-garment; any garment for the body coming not lower than the hips. Jackets for boys throughout the first half of the nineteenth century came only to the waist, whether buttoned up or left open in front, and a similar garment is still worn by men in certain trades or occupations. Short outer garments designed for protection from the weather and worn by men of rough occupations are called by this name: as, a monkey-jacket. Compare zouave-jacket, smoking-jacket.
3. n. A waistcoat or vest.
4. n. 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.
5. n. 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. Felt, wool, mineral-wool, paper, wood lagging, asbestos, and many other materials are in common use for jacketing steam-cylinders and -pipes, and pipes, tanks, etc., in which it is desirable to prevent freezing. Air-compressor cylinders are usually supplied with water-jackets for cooling the cylinders, which would otherwise become very hot from heat absorbed from the air, the work of compression being converted into heat in the compressed air, which thus acquires a high temperature. These cylinders are inclosed in metal shells which leave an annular space between them and the cylinder, and through this space cool water is kept constantly flowing by the aid of a pump or other device. When a steam-cylinder is thus inclosed, and the annular space is supplied with live steam, the arrangement is called a steam-jacket.The condensation which would otherwise occur in the cylinder during the periods of induction and expansion is thus prevented, and a considerable economy is effected. See cut under air-engine.
6. n. 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.
7. n. A young seal: so called from the rough fur.
8. 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.
9. To beat; thrash.
10. n. The loose wrapper of paper which protects the binding of a book.
11. n. The sheet of cardboard or thick paper which covers the impression surface of a printing-cylinder.
12. n. The hide or other natural covering of various animals, as sheep, seals, fish, etc.
13. n. The skin of a potato.

Wiktionary

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

GNU Webster's 1913

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

WordNet 3.0

1. v. provide with a thermally non-conducting cover
2. n. the outer skin of a potato
3. v. put a jacket on
4. n. a short coat
5. n. the tough metal shell casing for certain kinds of ammunition
6. n. (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth
7. n. an outer wrapping or casing