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. [See Illust. of Cannon.]