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breechblock > define

noun

  • A metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing.
by WordNet 3.0 © 2006 by Princeton University
(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 It is withdrawn for the insertion of a cartridge, and closed again before the gun is fired.
by Webster's Revised Unabridged Dictionary