swim bladder swim • swim bow · · · Info · Definitions · Synonyms · Characters · · swim bladder · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) an air-filled sac near the spinal column in many fishes that helps maintain buoyancy. Synonyms: air bladder, swim bladder, float. · · Noun Definition 1 Synonyms · · · air bladder · · Synonym 1 float · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D r latin small letter r U+0072 s latin small letter s U+0073 w latin small letter w U+0077