a large antelope (Oryx gazella) of S Africa, with long, straight horns and a tufted tail
See gemsbok in American Heritage Dictionary 4
(gĕmzˈbŏkˌ)
noun
A large antelope (Oryx gazella) of arid regions of southern Africa, having long sharp straight horns, a tufted tail, and distinctive black and white markings on the head.