{ } n. [ Hind. & Per. nīlgāw, prop., a blue cow; Per. nīl blue + gāw cow. See Lilac, and Cow the animal. ] (Zool.) A large Asiatic antelope (Boselaphus tragocamelus, syn. Portax tragocamelus), found in Northern India; called also the blue bull. It has short horns, a black mane, and a bunch of long hair on the throat. The general color is grayish brown; the male is blue-grey with white markings, and the female is brownish with no horns. [ Written also neelghau, nilgau, nylghai, and nylghaie. ]
Syn. -- nilgai, nylghai, blue bull, Boselaphus tragocamelus. [ 1913 Webster + WordNet 1.5 ]