/ Dictionary / Index N North Sea: Meaning and Definition of Find definitions for: North' Sea' Pronunciation: [key] an arm of the Atlantic between Great Britain and the European mainland. ab. 201,000 sq. mi. (520,600 sq. km); greatest depth, 1998 ft. (610 m). Formerly, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Northrup North Slope Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language