Meaning of FIN in English
/ fɪn; NAmE / noun
a thin flat part that sticks out from the body of a fish, used for swimming and keeping balance
—picture at fish
a thin flat part that sticks out from the body of a vehicle, an aircraft, etc., used for improving its balance and movement :
—picture at plane
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. 2005