nylgau

CIDE DICTIONARY

nylgau, n. [Hind. & Per. nīlgāw, prop., a blue cow; Per. nīl blue + gāw cow. See Lilac, and Cow the animal.].

 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.  [1913 Webster]