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plural musketoons
(now historical) A firearm, similar to a musket but with a shorter barrel and a large bore. quotations
And d'Artagnan set the example. Then, turning toward Planchet, he made him a sign to uncock his musketoon. The Englishmen, convinced of these peaceful proceedings, sheathed their swords grumblingly.
1844, Alexandre Dumas (translated by William Robson), The Three Musketeers Chapter 27
(obsolete) One who is armed with such a musket.