/ Dictionary / Index S sea wall: Meaning and Definition of Find definitions for: sea' wall" Pronunciation: [key] a strong wall or embankment to prevent the encroachments of the sea, serve as a breakwater, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: seawall (Thesaurus) sea urchin sea walnut Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language