WordReference Random House Unabridged Dictionary of American English © 2017
ra•di•o•i•so•tope  (rā′dē ō īsə tōp′),USA pronunciation n. 
  1. Chemistry, Medicinea radioactive isotope, usually artificially produced: used in physical and biological research, therapeutics, etc.
ra•di•o•i•so•top•ic  (rā′dē ō ī′sə topik),USA pronunciation adj. 
  • 1940–45; radio- + isotope

Collins Concise English Dictionary © HarperCollins Publishers::

radioisotope /ˌreɪdɪəʊˈaɪsətəʊp/ n
  1. an isotope that is radioactive

radioisotopic /ˌreɪdɪəʊˌaɪsəˈtɒpɪk/ adj

'radioisotope' also found in these entries:

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