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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