Breadcrumb Home > Thesaurus > U Synonyms of uranium Find synonyms for: Noun1. uranium, U, atomic number 92, metallic element, metalusage: a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weaponsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of uranium (Dictionary) ✖ Related Content Daily Word Quiz: dubitable Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language