nil·gai (nĭl'gī) n.
pl.nil·gais or nilgai A large, long-legged antelope (Boselaphus tragocamelus) of India, the male of which has short, sturdy horns and a tuft of long hair under the chin.
[Hindi nīlgāī, feminine of nīlgāw : nīl, dark blue (from Sanskrit nīla-) + gāw, ox, cow (from Sanskrit gauḥ; see gwou- in Indo-European roots).]
(species Boselaphus tragocamelus), Indian antelope, family Bovidae (order Artiodactyla), that ranges alone or in small groups in open plains or light forests.
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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