Breadcrumb Home > Thesaurus > F Synonyms of fissionable Find synonyms for: Adjective 1. fissionable (vs. nonfissionable), fissile usage: capable of undergoing nuclear fission; "a fissionable nucleous"; "fissionable material" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of fissionable (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: eponymous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language