/ Dictionary / Index N Niihau: Meaning and Definition of Find definitions for: Ni•i•ha•u Pronunciation: (nē'ē-hä', nē'hou), [key] — n. an island in NW Hawaii, W of Kauai. 237; 72 sq. mi. (186 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Niigata Nijinsky Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language