radioimmunology Syllabification: (ra·di·o·im·mu·nol·o·gy)Pronunciation: /ˌrādēōˌimyəˈnäləjē/Definition of radioimmunology noun the use of radioactively labeled antigens and antibodies in medical and biological research. Derivatives radioimmunologicalPronunciation: /-ˌimyənəˈläjikəl/ adjective radioimmunologicallyPronunciation: /-ik(ə)lē/ adverb radioimmunology in other Oxford dictionaries Definition of radioimmunology in the British & World English dictionary