[rey-dee-oh-ahy-suh-tohp] /ˌreɪ di oʊˈaɪ səˌtoʊp/

a radioactive , usually artificially produced: used in physical and biological research, therapeutics, etc.
an isotope that is radioactive

1946, from radio-, comb. form of radiation, + isotope.

radioisotope ra·di·o·i·so·tope (rā’dē-ō-ī’sə-tōp’)
A naturally or artificially produced radioactive isotope.
A radioactive isotope of a chemical element. Carbon 14 and radon 222 are examples of naturally occurring radioactive isotopes.


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