Source : Webster's Revised Unabridged Dictionary (1913)

Gemsbok \Gems"bok\, n. [D.; akin to G. gemsbock the male or buck
   of the chamois; gemse chamois, goat of the Alps + bock buck.]
   (Zo["o]l.)
   A South African antelope ({Oryx Capensis}), having long,
   sharp, nearly straight horns.