1. A receptor that normally responds to radiant energy such as light or heat. 2. A receptor used as a binding agent for unlabeled and radiolabeled analyte in a type of competitive binding assay called r. assay.
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ra·dio·re·cep·tor (ra″de-o-re-sepґtər) 1. a receptor for the stimuli that are excited by radiant energy, such as light or heat. 2. a receptor to which a radioligand can bind; see also radioreceptor assay, under assay.Medical dictionary. 2011.