/ Dictionary / Index N national seashore: Meaning and Definition of Find definitions for: na'tional sea'shore Pronunciation: [key] — (sometimes caps.) an area of seacoast set aside and maintained by the U.S. government for purposes of recreation or wildlife study. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. National Science Foundation National Security Council Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language