/ Dictionary / Index R radioimmunology: Meaning and Definition of Find definitions for: ra•di•o•im•mu•nol•o•gy Pronunciation: (rā"dē-ō-im"yu-nol'u-jē), [key] — n. the study of biological substances or processes with the aid of antigens or antibodies labeled with a radioactive isotope. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radioimmunoassay radio interferometer Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language