/ Dictionary / Index I Irra: Meaning and Definition of Find definitions for: Ir•ra Pronunciation: (ēr'ä), [key] — n. the Akkadian god of pestilence. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Iroquois irradiance 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