/ Dictionary / Index R radiatus: Meaning and Definition of Find definitions for: ra•di•a•tus Pronunciation: (r?"d?-?'tus), [key] ? adj. Meteorol. (of a cloud) having bands that appear to converge toward a point on the horizon. Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. radiator grille radical Related Content Daily Word Quiz: abscond Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language