/ Dictionary / Index S seaboard: Meaning and Definition of Find definitions for: sea•board Pronunciation: (sē'bôrd", -bōrd"), [key] — n. the line where land and sea meet. a region bordering a seacoast: the Eastern seaboard. —adj. bordering on or adjoining the sea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: seaboard (Thesaurus) sea blite seaboot Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language