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radioisotope

ra·dio·iso·tope

noun \ˌrād-ē-ō-ˈī-sə-ˌtōp\

: a radioactive isotope—compare radioelement

—ra·dio·iso·to·pic \-ˌī-sə-ˈtäp-ik, -ˈtōp-ik\ adjective

—ra·dio·iso·to·pi·cal·ly \-i-k(ə-)lē\ adverb

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