breechblock

Definition of Breechblock in English :

1. breech closer, breechblock

a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing

WordNet Lexical Database for English. Princeton University. 2010.

Breechblock

noun

a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing

noun

the block in a breech-loading gun which when closed receives the force of the combustion of the charge

n.

The metal part that closes the breech end of the barrel of a breechloading gun and that is removed to insert a cartridge and replaced before firing.