/ Dictionary / Index R rifled slug: Meaning and Definition of Find definitions for: ri'fled slug' Pronunciation: [key] a shotgun projectile with helical grooves on its sides for imparting a spin to it when it is fired through the smooth bore of the shotgun. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rifle bird rifle grenade Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language