Breadcrumb Home > Dictionary > Index S sea serpent: Meaning and Definition of Find definitions for: sea' ser"pent Pronunciation: [key] an enormous, imaginary, snakelike or dragonlike marine animal. (caps.)the constellation Hydra. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sea scout seashell ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language