Definition of radioisotope noun from the Oxford Advanced Learner's Dictionary

 

radioisotope

 noun
noun
BrE BrE//ˌreɪdiəʊˈaɪsətəʊp//
 
; NAmE NAmE//ˌreɪdioʊˈaɪsətoʊp//
 
(chemistry)
 
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a form of a chemical element which sends out radiation
See the Oxford Advanced American Dictionary entry: radioisotope