plural seahorses

Definition of seahorse

1 : walrus
2 : a mythical creature half horse and half fish
3 : any of a genus (Hippocampus of the family Syngnathidae) of small bony fishes that have the head angled downward toward the body which is carried vertically and are equipped with a prehensile tail

Illustration of seahorse

Illustration of seahorse

seahorse 3

Examples of seahorse in a Sentence

Recent Examples on the Web

The sea horse sculpture was replaced years ago with a cherub. Robert A. Cronkleton, kansascity, "Know that sad, empty fountain at Meyer Circle? Ward Parkway drivers, take heart," 11 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'seahorse.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of seahorse

15th century, in the meaning defined at sense 1

Keep scrolling for more

Learn More about seahorse

Statistics for seahorse

Look-up Popularity

Time Traveler for seahorse

The first known use of seahorse was in the 15th century

See more words from the same century

Keep scrolling for more

More Definitions for seahorse

sea horse


Kids Definition of sea horse

: a small fish with a head which looks like the head of a horse

Comments on seahorse

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


to take the place or position of

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
Spell It

Can you spell these 10 commonly misspelled words?


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!