dorsal fin


: a flat thin part on the back of some fish (such as sharks)

Dictionary Entries Near dorsal fin

Cite this Entry

“Dorsal fin.” Dictionary, Merriam-Webster, Accessed 4 Feb. 2023.

Kids Definition

dorsal fin

: a fin on the ridge along the middle of the back of a fish or sea mammal (as a whale)
Love words? Need even more definitions?

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

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
True or False

Test your knowledge - and maybe learn something along the way.

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?