Radioisotope Definition
 rādē-ō-īsə-tōp 
  radioisotopes
  
    noun
  
 A naturally occurring or artificially created radioactive isotope of a chemical element: used in medical therapy, biological research, etc.
 Webster's New World 
Other Word Forms of Radioisotope
Noun
Singular:
 radioisotopePlural:
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