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(of firearms) Having a bore with a smooth interior, i.e. one that has not been rifled. quotations examples
From what distance the smoothbore musket was able to fell a human target has been the source of debate for a long time.
2008, Earl J. Hess, The Rifle Musket in Civil War Combat: Reality and Myth, University Press of Kansas, page 13
plural smoothbores
(firearms) A cannon, gun or other firearm that has an unrifled barrel. examples