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English definition of “fin”

fin

noun [C] uk   /fɪn/ us  
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.
(Definition of fin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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