fin

noun (1)
\ˈfin \

Definition of fin 

(Entry 1 of 4)

1 : an external membranous process of an aquatic animal (such as a fish) used in propelling or guiding the body — see fish illustration

2 : something resembling a fin: such as

a : hand, arm

b(1) : an appendage of a boat (such as a submarine)

(2) : an airfoil attached to an airplane for directional stability

c : flipper sense 1b

d : any of the projecting ribs on a radiator or an engine cylinder

fin

verb
finned; finning

Definition of fin (Entry 2 of 4)

transitive verb

: to equip with fins

intransitive verb

1 : to show the fins above the water

2 : to move through water propelled by fins

fin

noun (2)

Definition of fin (Entry 3 of 4)

slang

: a 5-dollar bill

Definition of fin (Entry 4 of 4)

1 finance; financial

2 finish

Other Words from fin

Noun (1)

finlike \ˈfin-ˌlīk \ adjective

First Known Use of fin

Noun (1)

before the 12th century, in the meaning defined at sense 1

Verb

1933, in the meaning defined at transitive sense

Noun (2)

1916, in the meaning defined above

History and Etymology for fin

Noun (1)

Middle English finn, from Old English

Noun (2)

Yiddish finf five, from Middle High German, from Old High German — more at five

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Phrases Related to fin

dorsal fin

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Time Traveler for fin

The first known use of fin was before the 12th century

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More Definitions for fin

fin

noun
\ˈfin \

Kids Definition of fin

1 : any of the thin parts that stick out from the body of a water animal and especially a fish and are used in moving or guiding the body through the water

2 : something shaped like an animal's fin the fins of a missile

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More from Merriam-Webster on fin

See words that rhyme with fin

Spanish Central: Translation of fin

Nglish: Translation of fin for Spanish Speakers

Britannica English: Translation of fin for Arabic Speakers

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