/ Dictionary / Index R riot gun: Meaning and Definition of Find definitions for: ri'ot gun" Pronunciation: [key] a gun, esp. a shotgun with a short barrel, for quelling riots rather than inflicting serious injury. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Riot Act riotous Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language