Source : Webster's Revised Unabridged Dictionary (1913)

Bonnet \Bon"net\ (b[o^]n"n[e^]t), n. [OE. bonet, OF. bonet,
   bonete. F. bonnet fr. LL. bonneta, bonetum; orig. the name of
   a stuff, and of unknown origin.]
   1. A headdress for men and boys; a cap. [Obs.] --Milton.
      --Shak.

   2. A soft, elastic, very durable cap, made of thick, seamless
      woolen stuff, and worn by men in Scotland.

            And p?i?s and bonnets waving high.    --Sir W.
                                                  Scott.

   3. 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.

   4. Anything resembling a bonnet in shape or use; as,
      (a) (Fort.) A small defense work at a salient angle; or a
          part of a parapet elevated to screen the other part
          from enfilade fire.
      (b) A metallic canopy, or projection, over an opening, as
          a fireplace, or a cowl or hood to increase the draught
          of a chimney, etc.
      (c) A frame of wire netting over a locomotive chimney, to
          prevent escape of sparks.
      (d) A roofing over the cage of a mine, to protect its
          occupants from objects falling down the shaft.
      (e) In pumps, a metal covering for the openings in the
          valve chambers.

   5. (Naut.) An additional piece of canvas laced to the foot of
      a jib or foresail in moderate winds. --Hakluyt.

   6. The second stomach of a ruminating animal.

   7. An accomplice of a gambler, auctioneer, etc., who entices
      others to bet or to bid; a decoy. [Cant]

   {Bonnet head} (Zo["o]l.), a shark ({Sphyrna tiburio}) of the
      southern United States and West Indies.

   {Bonnet limpet} (Zo["o]l.), a name given, from their shape,
      to various species of shells (family {Calyptr[ae]id[ae]}).
      

   {Bonnet monkey} (Zo["o]l.), an East Indian monkey ({Macacus
      sinicus}), with a tuft of hair on its head; the munga.

   {Bonnet piece}, a gold coin of the time of James V. of
      Scotland, the king's head on which wears a bonnet. --Sir
      W. Scott.

   {To have a bee in the bonnet}. See under {Bee}.

   {Black bonnet}. See under {Black}.

   {Blue bonnet}. See in the Vocabulary.