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breechblock

or breech-block

[ breech-blok ]

noun

, Ordnance.
  1. a movable piece of metal for closing the breech in certain firearms.

breechblock

/ ˈbriːtʃˌblɒk /

noun

  1. a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of breechblock1

First recorded in 1880–85; breech + block
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Example Sentences

In the bore, pent in by the polished breechblock, is a cartridge which has failed in its duty.

Breechblock—a movable piece which closes the breech of a cannon.

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