/ Dictionary / Index I Ir gene: Meaning and Definition of Find definitions for: Ir gene Pronunciation: (ī'är'), [key] — Immunol. Immunol. a gene controlling the magnitude of the immune response to a particular antigen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. irenics Irgun Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language