bluebuck
/ˈbluːbʌk/noun
1 South African. The blue duiker, Cephalophus (or Philantomba) monticola. Now rare.
2 Historical. A large extinct antelope, Hippotragus leucophaeus, with a dark bluish coat and long curved horns, found in south-western South Africa until about 1800.
3The nilgai, Boselaphus tragocamelus, a large Indian antelope.
Origin
Early 19th century. From blue + buck.