blue bull

from WordNet (r) 3.0 (2006)

blue bull
    n 1: large Indian antelope; male is blue-grey with white
         markings; female is brownish with no horns [syn: {nilgai},
         {nylghai}, {nylghau}, {blue bull}, {Boselaphus
         tragocamelus}]

from The Collaborative International Dictionary of English v.0.48

Nylghau \Nyl"ghau\, Nylgau \Nyl"gau\, n. [Hind. & Per.
   n[imac]lg[=a]w, prop., a blue cow; Per. n[imac]l blue +
   g[=a]w cow. See {Lilac}, and {Cow} the animal.] (Zool.)
   A large Asiatic antelope ({Boselaphus tragocamelus}, syn.
   {Portax tragocamelus}), found in Northern India; called also
   the {blue bull}. It has short horns, a black mane, and a
   bunch of long hair on the throat. The general color is
   grayish brown; the male is blue-grey with white markings, and
   the female is brownish with no horns. [Written also
   {neelghau}, {nilgau}, {nylghai}, and {nylghaie}.]

   Syn: nilgai, nylghai, blue bull, {Boselaphus tragocamelus}.
        [1913 Webster + WordNet 1.5]