/ Dictionary / Index I immunofluorescence assay: Meaning and Definition of Find definitions for: immunofluores'cence as"say Pronunciation: [key] — Med. Med. a diagnostic blood test using the technique of immunofluorescence. Abbr.: IFA Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. immunofluorescence immunogen 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