The American Heritage® Dictionary of the English Language, 4th Edition
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.
n. The metal block that closes the breech of a breech-loading gun after insertion of the cartridge
the GNU version of the Collaborative International Dictionary of English
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 It is withdrawn for the insertion of a cartridge, and closed again before the gun is fired.
The Century Dictionary and Cyclopedia
n. A movable piece at the breech of a breech-loading gun, which is withdrawn for the insertion of a cartridge and closed before firing, to receive the impact of the recoil. E. H.Knight. See cut under breech-loader.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing
Word Usage
"We get to figure out how many of you can tell a breechblock from a breach cloth."