/ Dictionary / Index I irradiant: Meaning and Definition of Find definitions for: ir•ra•di•ant Pronunciation: (i-rā'dē-unt), [key] — adj. irradiating; radiant; shining. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. irradiance irradiate Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language