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breechblock

or breech-block

[breech-blok]
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noun Ordnance.
  1. a movable piece of metal for closing the breech in certain firearms.
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Origin of breechblock

First recorded in 1880–85; breech + block
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for breechblock

Historical Examples

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

    Artillery Through the Ages

    Albert Manucy


British Dictionary definitions for breechblock

breechblock

noun
  1. a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing
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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