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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 breech·block /ˈbriʧˌblɑk/
 閂體尾栓,螺體

From: Webster's Revised Unabridged Dictionary (1913)

 Breech·block n. The movable piece which closes the breech of a breech-loading firearm, and resists the backward force of the discharge. It is withdrawn for the insertion of a cartridge, and closed again before the gun is fired.
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From: WordNet (r) 2.0

 breechblock
      n : a metal block in breech-loading firearms that is withdrawn
          to insert a cartridge and replaced to close the breech
          before firing [syn: breech closer]