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Definition of bonnet:

  1. A covering for the head, worn by women, usually protecting more or less the back and sides of the head, but no part of the forehead. The shape of the bonnet varies greatly at different times; formerly the front part projected, and spread outward, like the mouth of a funnel.
  2. A frame of wire netting over a locomotive chimney, to prevent escape of sparks.
  3. A headdress for men and boys; a cap.
  4. A metallic canopy, or projection, over an opening, as a fireplace, or a cowl or hood to increase the draught of a chimney, etc.
  5. A roofing over the cage of a mine, to protect its occupants from objects falling down the shaft.
  6. A small defense work at a salient angle; or a part of a parapet elevated to screen the other part from enfilade fire.
  7. A soft, elastic, very durable cap, made of thick, seamless woolen stuff, and worn by men in Scotland.
  8. An accomplice of a gambler, auctioneer, etc., who entices others to bet or to bid; a decoy.
  9. An additional piece of canvas laced to the foot of a jib or foresail in moderate winds.
  10. Anything resembling a bonnet in shape or use
  11. In pumps, a metal covering for the openings in the valve chambers.
  12. The metal cover or shield over the motor.
  13. The second stomach of a ruminating animal.
  14. To take off the bonnet or cap as a mark of respect; to uncover.


tough, axle, lens hood, beanie, strong-armer, sunbonnet, cowling, bodywork, hoodlum, boater, cap, poke bonnet, exhaust hood, goon, bearskin, balaclava, toughie, biretta, armour, bumper, hood, chassis, armor, cowl, thug, punk, bandanna, baseball cap, bull bar, body, bathing cap.

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