/ Dictionary / Index T Treasure Island: Meaning and Definition of Find definitions for: Treas'ure Is'land Pronunciation: [key] (italics) a novel (1883) by R. L. Stevenson. an artificial island in San Francisco Bay, in W California; naval base. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. treasure hunt treasurer Related Content Daily Word Quiz: ravenous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language