NYLGAU

Nyl"ghau, Nyl"gau, n. Etym: [Hind. & Per. nilgaw, prop., a blue cow; Per. nil blue + gaw cow. See Lilac, and Cow the animal.] (Zoöl.)

Definition: A large Asiatic antelope (Boselaphus, or Portax, tragocamelus), found in Northern India. It has short horns, a black mane, and a bunch of long hair on the throat. The general color is grayish brown. [Written also neelghau, nilgau, and nylghaie.]

Source: Webster’s Unabridged Dictionary 1913 Edition