/ Dictionary / Index H Hainan: Meaning and Definition of Find definitions for: Hai•nan Pronunciation: (hī'nän'), [key] — n. an island in the South China Sea, separated from the mainland by the Hainan Strait: a part of Guangdong province. 2,800,000; 13,200 sq. mi. (34,200 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. haimish Hainan Strait Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language