Dictionary.com
definitions

nylghai

[nil-gahy]
noun, plural nyl·ghais, (especially collectively) nyl·ghai.
  1. nilgai.

nilgai

or nyl·ghai, nyl·ghau

[nil-gahy]
noun, plural nil·gais, (especially collectively) nil·gai.
  1. a large, Indian antelope, Boselaphus tragocamelus, the male of which is bluish gray with small horns, the female tawny and hornless.

Origin of nilgai

First recorded in 1880–85, nilgai is from the Hindi word nīlgāy literally, blue cow
Also called blue bull.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for nylghai

nilgai

nilghau or nylghau (ˈnɪlɡɔː)

noun plural -gai, -gais, -ghau or -ghaus
  1. a large Indian antelope, Boselaphus tragocamelus. The male is blue-grey with white markings and has small horns; the female is brownish and has no horns

Word Origin for nilgai

C19: from Hindi nīlgāw blue bull, from Sanskrit nīla dark blue + go bull
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012