breechblock

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breech·block

 (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(Firearms, Gunnery, Ordnance & Artillery) a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing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]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.breechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firingbreechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing
blockage, 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