1. any fish of the genus Hippocampus, of the pipefish family, having a prehensile tail, an elongated snout, and a head bent at right angles to the body.
2. a fabled marine animal with the foreparts of a horse and the hind parts of a fish.
3. a walrus. Also,sea'horse".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.