seahorse

noun
sea·​horse
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

First Known Use of seahorse

15th century, in the meaning defined at sense 1

Learn More About seahorse

Time Traveler for seahorse

Time Traveler

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

See more words from the same century

Dictionary Entries Near seahorse

sea hollyhock

seahorse

seahound

See More Nearby Entries 

Statistics for seahorse

Cite this Entry

“Seahorse.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/seahorse. Accessed 19 Aug. 2022.

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

More Definitions for seahorse

sea horse

noun

Kids Definition of sea horse

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

WORD OF THE DAY

Test Your Vocabulary

Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
Spell It

Can you spell these 10 commonly misspelled words?

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!