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Fin Definition

noun

A fixed or movable airfoil used to stabilize an aircraft, missile, or projectile in flight.
A membranous appendage extending from the body of a fish or other aquatic animal, used for propelling, steering, or balancing the body in the water.
A projecting vane used for cooling, as on a radiator or an engine cylinder.
A thin, usually curved projection attached to the rear bottom of a surfboard for stability.
See flipper.

verb-intransitive

To emerge with the fins above water.
To lash the water with the fins. Used of a dying whale.
To swim, as a fish.

verb-transitive

To equip with fins.

verb

To equip with fins.
source from Merriam-Webster
To show the fins above the water.
source from Merriam-Webster
To move through water propelled by fins.
source from Merriam-Webster
Swim under water by means of flippers:.
source from Oxford Dictionary

abbreviation

Finance; financial.
source from Merriam-Webster
Finish.
source from Merriam-Webster

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fin

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2 letter words with FIN

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if

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in

2

3 letter words with FIN

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fin

6

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