(Science: zoology) 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 colour is grayish brown.
Origin: Hind. & Per. Nilgaw, prop, a blue cow; Per. Nil blue _ gaw cow. See Lilac, and Cow the animal.