breechblock

breech·block

B0471100 (brēch′blŏk′)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.

breechblock

(ˈbriːtʃˌblɒk) n (Firearms, Gunnery, Ordnance & Artillery) a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing

breech•block

(ˈbritʃˌblɒk)

n. a movable piece of metal for closing the breech in certain firearms. [1880–85]

Thesaurus

Noun

1.

breechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firingbreech closerblockage, stoppage, occlusion, closure, block, stop - an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe"breech, rear of barrel, rear of tube - opening in the rear of the barrel of a gun where bullets can be loaded