Breadcrumb Home > Thesaurus > J Synonyms of jellyfish Find synonyms for: Noun 1. Portuguese man-of-war, man-of-war, jellyfish, siphonophore usage: large siphonophore having a bladderlike float and stinging tentacles 2. jellyfish, coelenterate, cnidarian usage: any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of jellyfish (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: inmediasres Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language