Sassaby \Sas"sa*by\, Sassabye \Sas"sa*bye\, n. (Zo["o]l.) A large African antelope ({Alcelaphus lunata}), similar to the hartbeest, but having its horns regularly curved.
sassaby n : a large South African antelope; considered the swiftest hoofed mammal [syn: {topi}, {Damaliscus lunatus}]