breech

English Thesaurus

1. opening in the rear of the barrel of a gun where bullets can be loaded (noun.artifact)

hypernym	:	opening,
definition	:	a vacant or unobstructed space that is man-made (noun.artifact)

part holonym	:	breech closer, breechblock,
definition	:	a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing (noun.artifact)

part meronym	:	barrel, cask,
definition	:	a cylindrical container that holds liquids (noun.artifact)