cas·ca·bel /ˈkæskəˌbɛl/
  Cas·ca·bel n.  The projection in rear of the breech of a cannon, usually a knob or breeching loop connected with the gun by a neck. In old writers it included all in rear of the base ring.
  Note: [See Illust. of Cannon.]
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  cascabel
       n : bell attached to a sleigh, or to harness of horse pulling a
           sleigh [syn: sleigh bell]