1. [syn: breechblock, breech closer]
The Collaborative International Dictionary of English v.0.48:
Breechblock \Breech"block\, n.
The movable piece which closes the breech of a breech-loading
firearm, and resists the backward force of the discharge. It
is withdrawn for the insertion of a cartridge, and closed
again before the gun is fired.
WordNet (r) 3.0 (2006):
n 1: a metal block in breech-loading firearms that is withdrawn
to insert a cartridge and replaced to close the breech
before firing [syn: breechblock, breech closer]