jacket

noun

1. a short coat, in any of various forms, usually opening down the front.
2. something designed to be placed around the upper part of the body for a specific purpose other than use as clothing: a life jacket.
3. a protective outer covering.
4. the skin of a potato, especially when it has been cooked.
5. book jacket.
6. the cover of a paperbound book, usually bearing an illustration.
7. a paper or cardboard envelope for protecting a phonograph record.
8. a metal casing, as the steel covering of a cannon, the steel cover around the core of a bullet, or the water jacket on certain types of machine guns.
9. a folded paper or open envelope containing an official document.

verb (used with object)

10. to put a jacket on (someone or something).

noun

1. a short coat, esp one that is hip-length and has a front opening and sleeves
2. something that resembles this or is designed to be worn around the upper part of the bodya life jacket
3. any exterior covering or casing, such as the insulating cover of a boiler
4. the part of the cylinder block of an internal-combustion engine that encloses the coolant
5. See dust jacket
6. 1. the skin of a baked potato
   2. (as modifier)jacket potatoes
7. a metal casing used in certain types of ammunition
8. US a cover to protect a gramophone recordBrit name: sleeve
9. mainly US a folder or envelope to hold documents

verb

10. (tr) to put a jacket on (someone or something)

n.

mid-15c., “short garment for men,” from Middle French jaquet “short coat with sleeves,” diminutive of Old French jaque, a kind of tunic, probably from Jacque, the male proper name, also the generic name of a French peasant (see jacquerie), but possibly associated with jaque (de mailles) “short, tight-fitting coat,” originally “coat of mail,” from Spanish jaco, from Arabic shakk “breastplate.” Iakke “a short, close-fitting stuffed or quilted tunic, often serving as a defensive garment” is attested in English from late 14c., and by c.1400 was being used for “woman’s short tunic.” Meaning “paper wrapper of a book” is first attested 1894.

n.

1. A fixed bandage applied around the body to immobilize the spine.
2. An artificial crown of a tooth composed of fired porcelain or acrylic resin.