seahorse

noun

sea·​horse ˈsē-ˌhȯrs 

plural seahorses

1

: 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

2

: a mythical creature half horse and half fish

3

: walrus

Illustration of seahorse

• seahorse 1

Examples of seahorse in a Sentence

Recent Examples on the Web

Male seahorses are known for carrying, feeding and hatching eggs directly from a pouch on their body. — Jackie Flynn Mogensen, Scientific American, 21 June 2026

According to the Journal of Fish Biology, the hairy ghost pipefish — loosely related to seahorses, pipefishes and sea dragons — may be found in Australia, Papua New Guinea, Fiji, New Caledonia and Tonga. — Shyla Watson, PEOPLE, 14 May 2026

The similarity is so strong that even the team from the beloved children’s show gave their full backing to name the seahorse relative after Big Bird’s woolly pal. — Andrew Paul, Popular Science, 13 May 2026

The other tanks, for Marcellus and the seahorses and the wolf eels, were on a stage. — Emily Zemler, Los Angeles Times, 7 May 2026

Word History

First Known Use

15th century, in the meaning defined at sense 3

Rhymes for seahorse

• concourse
• divorce
• endorse
• enforce
• indorse
• midcourse
• outsource
• perforce
• racehorse
• remorse
• workforce
• workhorse

Kids Definition

sea horse

noun

1

: a mythical animal half horse and half fish

2

: a small fish with bony plates covering its body and a head that looks like a horse's head