breechblock

Here is the meaning of the word, breechblock

This word is in the TWL06 Dictionary ₂₆
This word is in the SOWPODS Dictionary ₂₆

Breechblock(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 It is withdrawn for the insertion of a cartridge, and closed again before the gun is fired.