/ Dictionary / Index S Sumatra: Meaning and Definition of Find definitions for: Su•ma•tra Pronunciation: (soo-mä'tru), [key] — n. a large island in the W part of Indonesia. 20,800,000; 164,147 sq. mi. (425,141 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sumatra (Thesaurus) sum and substance Sumatra camphor Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language