cas·ca·bel (ksk-bl) n. 1. A rounded projection behind the breech of a muzzleloading cannon. Spanish origin. Artillery use. After 1800 AD, it became adjustable. The breech is closed in large calibres by a CASCABEL(E) screw, which is a solid block of forged wrought iron, screwed into the breech coil until it pressed against the end of the … Continue reading Cascabel