WordReference Random House Unabridged Dictionary of American English © 2017
ra•di•o•im•mu•no•as•say  (rā′dē ō im′yə nō asā, -a sā, -i myo̅o̅′-),USA pronunciation n. 
  1. Medicinea test procedure that integrates immunologic and radiolabeling techniques to measure minute quantities of a substance, as a protein, hormone, or drug, in a given sample of body fluid or tissue.
  • radio- + immunoassay 1960–65

Collins Concise English Dictionary © HarperCollins Publishers::

radioimmunoassay /ˈreɪdɪəʊˌɪmjʊnəʊˈæseɪ/ n
  1. a sensitive immunological assay, making use of antibodies and radioactive labelling, for the detection and quantification of biologically important substances, such as hormone concentrations in the blood


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