/ Dictionary / Index I immunodiffusion: Meaning and Definition of Find definitions for: im•mu•no•dif•fu•sion Pronunciation: (im"yu-nō-di-fy'zhun, i-my"-), [key] — n. any of various analytical techniques that involve antigen and antibody solutions diffusing toward each other in a gel until antibody binds specifically to antigen to form a precipitate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. immunodiagnostics immunoelectrophoresis 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