/ Dictionary / Index S smoothbore: Meaning and Definition of Find definitions for: smooth•bore Pronunciation: (sm'bôr", -bōr"), [key] — adj. (of firearms) having a smooth bore; not rifled. —n. a smoothbore gun. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: smoothbore (Thesaurus) smooth smooth breathing Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language