Sea" horse` (?).
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.
2. Zool. (a)
Any fish of the genus Hippocampus.
⇒ In a passage of Dryden's, the word is supposed to refer to the hippopotamus.
© Webster 1913.