Breadcrumb Home > Thesaurus > R Synonyms of radioisotope Find synonyms for: Noun 1. radioisotope, isotope usage: a radioactive isotope of an element; produced either naturally or artificially WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of radioisotope (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language