\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}.]