/ Thesaurus / A Synonyms of atomic number 85 Find synonyms for: Noun1. astatine, At, atomic number 85, chemical element, element, halogenusage: a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thoriumWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: garrulous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language