jacket

 
Pronunciation: /ˈdʒakɪt/

noun

  • 1an outer garment extending either to the waist or the hips, typically having sleeves and a fastening down the front: [as modifier]: he put his hand in his jacket pocket
  • 2an outer covering, especially one placed round a tank or pipe to insulate it.
  • the dust jacket of a book.
  • a record sleeve.
  • 3British the skin of a potato: potatoes cooked in their jackets
  • informal a jacket potato.
  • 4US a folder or envelope containing an official document or file.
  • 5a steel frame fixed to the seabed, forming the support structure of an oil production platform.

verb (jackets, jacketing, jacketed)

[with object]
  • cover with a jacket.

Origin:

late Middle English: from Old French jaquet, diminutive of jaque (see jack2)