sea horse

  1. any of a genus (Hippocampus) of small, semitropical, marine bony fishes of the same family (Syngnathidae, order Gasterosteiformes) as the pipefishes, having a slender prehensile tail, plated body, and a head and foreparts somewhat suggestive of those of a horse: it normally swims in an upright position, and the male incubates the eggs in a pouch in his abdomen
    also written seahorse
  2. walrus
  3. a mythical sea creature, half fish and half horse

See sea horse in American Heritage Dictionary 4

noun
  1. A small marine fish of the genus Hippocampus, characteristically swimming in an upright position and having a prehensile tail, a horselike head, and a body covered with bony plates.
  2. See walrus.
  3. Mythology An animal, half fish and half horse, ridden by Neptune and other sea gods.
  4. A large white-capped wave.
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