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.

Source : WordNet®

gemsbok
     n : large South African oryx with a broad black band along its
         flanks [syn: {gemsbuck}, {Oryx gazella}]
     [also: {gemboks} (pl)]