English dictionary smoothbore meaning and definition Definition and meaning of smoothbore at MeaningMonkey.org. smoothbore meaning and definition in the English Dictionary. SMOOTHBORE nounDefinition of smoothbore (noun)a firearm that has no riflingSMOOTHBORE adjectiveDefinition of smoothbore (adjective)of a firearm; not having rifling or internal spiral grooves inside the barrelsynonyms: unrifledantonym: rifled Source: Princeton University Wordnet
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