Breadcrumb Home > Thesaurus > T Synonyms of thorium Find synonyms for: Noun 1. thorium, Th, atomic number 90, metallic element, metal usage: a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of thorium (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: quisling Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language