/ Dictionary / Index S Sulu Sea: Meaning and Definition of Find definitions for: Su'lu Sea' Pronunciation: [key] a sea in the W Pacific, between the SW Philippines and Borneo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sulu Archipelago Sulzberger Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language