/ Dictionary / Index R radiator grille: Meaning and Definition of Find definitions for: ra'diator grille" Pronunciation: [key] a grille in an automobile or the like for air cooling of the liquid in the cooling system. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radiator radiatus Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language