/ Dictionary / Index I immunogen: Meaning and Definition of Find definitions for: im•mu•no•gen Pronunciation: (i-my'nu-jun, -jen"), [key] — n. any substance or cell introduced into the body in order to generate an immune response. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: immunogen (Thesaurus) immunofluorescence assay immunogenetics 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