1. a hat, usually tying under the chin and often framing the face, formerly much worn by women but now worn mostly by children.
  2. Informal. any hat worn by women.
  3. Chiefly Scot. a man’s or boy’s cap.
  4. a bonnetlike headdress: an Indian war bonnet.
  5. any of various hoods, covers, or protective devices.
  6. a cowl, hood, or wind cap for a fireplace or chimney, to stabilize the draft.
  7. the part of a valve casing through which the stem passes and that forms a guide and seal for the stem.
  8. a chamber at the top of a hot-air furnace from which the leaders emerge.
  9. Chiefly British. an automobile hood.
  10. Nautical. a supplementary piece of canvas laced to the foot of a fore-and-aft sail, especially a jib, in light winds.

verb (used with object)

  1. to put a bonnet on.


  1. Georges [zhawrzh] /ʒɔrʒ/, 1889–1973, French statesman.


  1. any of various hats worn, esp formerly, by women and girls, usually framing the face and tied with ribbons under the chin
  2. Also called: (in Scotland) bunnet (ˈbʌnɪt)
    1. a soft cloth cap
    2. formerly, a flat brimless cap worn by men
  3. the hinged metal part of a motor vehicle body that provides access to the engine, or to the luggage space in a rear-engined vehicle
  4. a cowl on a chimney
  5. nautical a piece of sail laced to the foot of a foresail to give it greater area in light winds
  6. (in the US and Canada) a headdress of feathers worn by some tribes of American Indians, esp formerly as a sign of war

late 14c., Scottish bonat “brimless hat for men,” from Old French bonet, short for chapel de bonet, from bonet (12c., Modern French bonnet) “kind of cloth used as a headdress,” from Medieval Latin bonitum “material for hats,” perhaps a shortening of Late Latin abonnis “a kind of cap” (7c.), which is perhaps from a Germanic source.

  1. Swiss naturalist who discovered parthenogenesis when he observed that aphid eggs could develop without fertilization. Bonnet was also one of the first scientists to study photosynthesis.

see bee in one’s bonnet.

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