breechblock or breech-block [breech-blok] EXAMPLES|WORD ORIGIN noun Ordnance. a movable piece of metal for closing thein certain firearms.
Origin of breechblock First recorded in 1880–85;+ Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019 Examples from the Web for breechblock Historical Examples of breechblock
Breechblock—a movable piece which closes the breech of a cannon.
British Dictionary definitions for breechblock breechblock noun a metal block in breech-loading firearms that is withdrawn to insert the cartridge and replaced to close the breech before firing Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William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