n. 炮的尾钮, 响尾蛇, 球形穿孔的铃

[ noun ]
a bell attached to a sleigh, or to the harness of a horse that is pulling a sleigh
<noun.artifact>

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}.]