seahorse

noun

sea·​horse ˈsē-ˌhȯrs How to pronounce seahorse (audio)
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

Illustration of seahorse
  • seahorse 1

Examples of seahorse in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The winery’s door handles are seahorses, and the bathrooms, marked with mermaid and pirate signage, each feature a large mermaid mural inside, painted by Barrett. Jess Lander, San Francisco Chronicle, 8 Apr. 2026 Fireflies, male seahorses, dark chocolate, cenotes, hummingbirds, coral, all make appearances—or are recurring characters—in these poems. Diana Arterian, Literary Hub, 7 Apr. 2026 Visitors can explore an underwater world that includes an ocean tunnel, sea turtle rescue center, an interactive touch pool, jellyfish, colorful tropical fish, seahorse displays and more. Alyson Rodriguez, Dallas Morning News, 25 Feb. 2026 There was Pounce the cat, who lived in a halfway house made from an empty box of Cheez-Its, and Neon the seahorse, who had stolen $10 million from Wells Fargo. Maria Zorn, Longreads, 24 Feb. 2026 Seadragons, the plaques inform, are related to seahorses — but with leafy appendages. Dewayne Bevil, The Orlando Sentinel, 18 Feb. 2026 Every morning, seahorses greet their other half by performing a rhythmic dance that can last minutes or even hours to strengthen their bond. K. R. Callaway, Scientific American, 13 Feb. 2026 That’s later, though, after Angie manages to jam her finger in the door while wearing an inflatable seahorse costume and the whole crew somehow finds the time to get ready in really elaborate zombie makeup. Rafaela Bassili, Vulture, 10 Feb. 2026 But a seahorse is a fish, and so is Bombay duck. Richard Lederer, San Diego Union-Tribune, 31 Jan. 2026

Word History

First Known Use

15th century, in the meaning defined at sense 3

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

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Cite this Entry

“Seahorse.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/seahorse. Accessed 17 Apr. 2026.

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
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