Source : Webster's Revised Unabridged Dictionary (1913)

Cascabel \Cas"ca*bel\, n. [Sp. cascabel a little bell, also (fr.
   the shape), a knob at the breech end of a cannon.]
   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}.]

Source : WordNet®

cascabel
     n : bell attached to a sleigh, or to harness of horse pulling a
         sleigh [syn: {sleigh bell}]