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: Webster's Revised Unabridged Dictionary (1913)