fin

noun (1)
\ ˈfin How to pronounce fin (audio) \

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
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 How to pronounce fin (audio) \ 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

Keep scrolling for more

Learn More About fin

Time Traveler for fin

Time Traveler

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

See more words from the same century

Dictionary Entries Near fin

fimicolous

fin

finable

See More Nearby Entries 

Statistics for fin

Cite this Entry

“Fin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fin. Accessed 24 Sep. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for fin

fin

noun
\ ˈfin How to pronounce fin (audio) \

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

More from Merriam-Webster on fin

Thesaurus: All synonyms and antonyms for fin

Nglish: Translation of fin for Spanish Speakers

Britannica English: Translation of fin for Arabic Speakers

WORD OF THE DAY

Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!