/ Thesaurus / S Synonyms of swim bladder Find synonyms for: Noun1. air bladder, swim bladder, float, sacusage: an air-filled sac near the spinal column in many fishes that helps maintain buoyancyWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language