breech·​block ˈbrēch-ˌbläk How to pronounce breechblock (audio)
: the block in breech-loading firearms that closes the rear of the barrel against the force of the charge and prevents gases from escaping

Examples of breechblock in a Sentence

Recent Examples on the Web The lower receiver in Roh's case does not have a bolt or breechblock and is not threaded to receive the barrel, Nicolaysen noted. Scott Glover, CNN, 11 Oct. 2019 The definition is found instead in the Code of Federal Regulations: That part of a firearm which provides housing for the hammer, bolt or breechblock, and firing mechanism, and which is usually threaded at its forward portion to receive the barrel. Robert Verbruggen, National Review, 18 Oct. 2019

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'breechblock.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1855, in the meaning defined above

Time Traveler
The first known use of breechblock was in 1855

Dictionary Entries Near breechblock

Cite this Entry

“Breechblock.” Dictionary, Merriam-Webster, Accessed 24 Jun. 2024.

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