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fin

noun [C]
 
 
/fɪn/

Definition

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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