Meaning of FIN in English

FIN

/ fɪn; NAmE / noun

1.

a thin flat part that sticks out from the body of a fish, used for swimming and keeping balance

—picture at fish

2.

a thin flat part that sticks out from the body of a vehicle, an aircraft, etc., used for improving its balance and movement :

tail fins

—picture at plane

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WORD ORIGIN

Old English finn , fin , of Germanic origin; related to Dutch vin and probably ultimately to Latin pinna feather, wing.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.