Breadcrumb Home > Thesaurus > R Synonyms of radiothorium Find synonyms for: Noun 1. thorium-228, radiothorium, thorium, Th, atomic number 90 usage: radioactive isotope of thorium with mass number 228 WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of radiothorium (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: rococo Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language