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

There are shallow but rich dives; full-of-life, accessible wrecks; and thriving reefs, including my favorite spot, the unlikely cement plant, with seahorses and octopus reclining beneath its pier pilings—pilings that are fantastical once underwater. — Jonnie Bayfield, Condé Nast Traveler, 19 July 2026

The second is about pygmy seahorses, which are the size of your fingernail and live in coral. — Michael James Rocha, San Diego Union-Tribune, 12 July 2026

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

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