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. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: irascible Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language