/ Dictionary / Index S Sulu Archipelago: Meaning and Definition of Find definitions for: Su'lu Archipel'ago Pronunciation: [key] an island group in the SW Philippines, separating the Sulawesi Sea from the Sulu Sea. 555,239; 1086 sq. mi. (2813 sq. km). Cap.: Jolo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sulu Sulu Sea Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language