/ Dictionary / Index I isoantigen: Meaning and Definition of Find definitions for: i•so•an•ti•gen Pronunciation: (ī"sō-an'ti-jun, -jen"), [key] — n. (formerly) an alloantigen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isoantibody isobar Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language