Breadcrumb Home > Thesaurus > C Synonyms of caesium Find synonyms for: Noun 1. cesium, caesium, Cs, atomic number 55, metallic element, metal usage: a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of caesium (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language