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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A metal plate that covers the trunnions of a cannon and holds it in place.

from the GNU version of the Collaborative International Dictionary of English

  • n. A metal covering plate which passes over the trunnions of a cannon, and holds it in place.

from The Century Dictionary and Cyclopedia

  • n. In gunnery, one of the strong plates of iron or brass which are fitted over the trunnions of a gun and secure it on the carriage. See cut under gun-carriage.


cap +‎ square (Wiktionary)


  • Doubtless Bampfylde's fire had weakened the capsquare and now the twelve-pounder was as good as useless.

    Sharpe's Siege

  • Its capsquare was broken, but the barrel was charged with the last of the garrison's dry powder and rammed with metal scraps, stone fragments, and rusty nails.

    Sharpe's Siege


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