RADIOISOTOPE Meaning of RADIOISOTOPE in English radioisotope BrE AmE ˌreɪd i‿əʊ ˈaɪs ə ʊ təʊp AmE \ -oʊ ˈaɪs ə toʊp▷ radioisotope|s s Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012