dorsal fin dorsal • dorsal horn · · · Info · Definitions · Characters · · dorsal fin · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance. Synonyms: dorsal fin. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073