Meaning of “pectoral fin” in the English Dictionary

british dictionary

"pectoral fin" in British English

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pectoral finnoun [ C ]

uk /ˈpek.tər.əl ˌfɪn/ us /ˈpek.tɔːr.əl ˌfɪn/ specialized

the fin on each side of a fish near the front of its body, used for controlling the direction the fish goes in and for slowing it down

(Definition of “pectoral fin” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)