breechblock

noun
breech·​block | \ˈbrēch-ˌbläk \

Definition of breechblock 

: the block in breech-loading firearms that closes the rear of the barrel against the force of the charge and prevents gases from escaping

First Known Use of breechblock

1855, in the meaning defined above

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Dictionary Entries near breechblock

bred out

bree

breech

breechblock

breechcloth

breechclout

breech delivery

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The first known use of breechblock was in 1855

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