/ Thesaurus / A Synonyms of atomic number 88 Find synonyms for: Noun1. radium, Ra, atomic number 88, metallic element, metalusage: an intensely radioactive metallic element that occurs in minute amounts in uranium oresWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language