/ Dictionary / Index S sea horse: Meaning and Definition of Find definitions for: sea' horse" Pronunciation: [key] 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. a fabled marine animal with the foreparts of a horse and the hind parts of a fish. a walrus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: seahorse (Thesaurus) sea hollyhock sea-island cotton Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language