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English definition of “fin”

fin

noun [C]     /fɪn/
a thin vertical part sticking out of the body of especially a fish or an aircraft that helps balance and movement : We could see the fin of a shark as it slowly circled our boat . a fish's dorsal fin The aircraft has a long tail fin.Parts of aeroplanesMiscellaneous animal body parts
(Definition of fin noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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