pectoral fin pectoral arch • pectoralgia · · · Info · Definitions · Characters · · pectoral fin · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) either of a pair of fins situated just behind the head in fishes that help control the direction of movement. Synonyms: pectoral fin. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 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 p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074