/ Dictionary / Index N nilgai: Meaning and Definition of Find definitions for: nil•gai Pronunciation: (nil'gī), [key] — pl. -gais, -gai. a large, Indian antelope, Boselaphus tragocamelus, the male of which is bluish gray with small horns, the female tawny and hornless. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nilgai (Thesaurus) Niles Nilgiri Hills Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language