- A fabulous creature, half horse and half fish, represented in classic mythology as driven by sea dogs or ridden by the Nereids. It is also depicted in heraldry. See Hippocampus.
- The walrus.
- Any fish of the genus Hippocampus.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). sea horse. Retrieved September 29, 2026, from http://smartdefine.org/sea_horse/definitions/2059367 |
| Chicago | Webster's. 2011. "sea horse" http://smartdefine.org/sea_horse/definitions/2059367 (accessed September 29, 2026). |
| Harvard | Webster's 2011, sea horse, Smart Define, viewed 29 September, 2026, <http://smartdefine.org/sea_horse/definitions/2059367>. |
| MLA | Webster's. "sea horse" 28 May 2011. Web. 29 September 2026. <http://smartdefine.org/sea_horse/definitions/2059367> |