abdominal fin


Definition of abdominal fin 

: one of the posterior paired fins of fishes : pelvic fin

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of abdominal fin

1775, in the meaning defined above

Keep scrolling for more

Learn More about abdominal fin

Share abdominal fin

Statistics for abdominal fin

Look-up Popularity

Time Traveler for abdominal fin

The first known use of abdominal fin was in 1775

See more words from the same year

Comments on abdominal fin

What made you want to look up abdominal fin? Please tell us where you read or heard it (including the quote, if possible).


to enclose within walls

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
Spell It

Can you spell these 10 commonly misspelled words?

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

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