large African antelope with lyre-shaped horns that curve backward. [WordNet 1.5]
hartebeest, n. [D. hertebeest. See Hart, and Beast.].
A large South African antelope (Alcelaphus caama), formerly much more abundant than it is now. The face and legs are marked with black, the rump with white. [1913 Webster]
Any anteleope of the genus Alcelaphus and certain species of Darnaliscus. [PJC]