smoothbore

adjective
smooth·​bore | \ˈsmüt͟h-ˈbȯr \

Definition of smoothbore 

of a firearm

: having a barrel with an unrifled bore

Other Words from smoothbore

smoothbore \ˈsmüt͟h-​ˌbȯr \ noun

First Known Use of smoothbore

1754, in the meaning defined above

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The first known use of smoothbore was in 1754

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