Oryx beisa

from The Collaborative International Dictionary of English v.0.48

Oryx \O"ryx\ ([=o]"r[i^]ks), prop. n. [NL., from Gr. 'o`ryx a
   kind of gazelle or antelope.] (Zool.)
   A genus of African antelopes which includes the gemsbok, the
   leucoryx, the bisa antelope ({Oryx beisa}), and the beatrix
   antelope ({Oryx beatrix}) of Arabia.
   [1913 Webster]