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Definition of fin
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 asa : hand, armb (1) : an appendage of a boat (such as a submarine) (2) : an airfoil attached to an airplane for directional stabilityc : flipper 1bd : any of the projecting ribs on a radiator or an engine cylinder
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Origin and Etymology of fin
Middle English finn, from Old English
Other Anatomy Terms
fin
Definition of fin
finned
;finning
transitive verb
: to equip with fins
intransitive verb
1 : to show the fins above the water
2 : to move through water propelled by fins
First Known Use of fin
1933
fin
Definition of fin
slang
: a 5-dollar bill
Origin and Etymology of fin
Yiddish finf five, from Middle High German, from Old High German — more at five
fin
Definition of fin
1 finance; financial
2 finish
FIN Defined for Kids
fin
playDefinition of fin for Students
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
Learn More about fin
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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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