noun
also nil·ghai ˈnilˌgī
( plural nilgais or nilgai also nilghais or nilghai )
Etymology: Hindi nīlgāw blue bull (feminine nīlgāī ), from Sanskrit nīla dark blue + go bull, cow — more at aniline , cow (animal)
: a large bluish gray antelope ( Boselaphus tragocamelus ) of India, the male of which has short horns, a black mane, and a bunch of long hair on the throat — called also blue bull