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The meaning of FIN is an external membranous process of an aquatic animal (such as a fish) used in propelling or guiding the body.

Jan 1, 2026 · fin (plural fins) (ichthyology, zootomy) One of the appendages of a fish, used to propel itself and to manoeuvre / maneuver. quotations The fish's fins minimize water flow.

FIN meaning: 1. a thin vertical part sticking out of the body of especially a fish or an aircraft that helps…. Learn more.

FIN in British English abbreviation for Finland (international car registration)

fin (fɪn) n slang US a five-dollar bill [from Yiddish finf five, ultimately from Old High German funf, finf]

Definition of fin noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

fin meaning, definition, what is fin: one of the thin body parts that a fish u...: Learn more.

FIN definition: a five-dollar bill. See examples of fin used in a sentence.

FIN meaning: 1 : a thin flat part that sticks out from the body of a fish and is used in moving or guiding the fish through water; 2 : a part on a machine (such as a car or airplane) that is shaped like a fish's fin