The Collaborative International Dictionary of English v.0.48:

Springbok \Spring"bok`\ (-b[o^]k`), Springbuck \Spring"buck`\
   (-b[u^]k`), n. [D. springbok; springen to spring, leap + bok
   a he-goat, buck.] (Zool.)
   A South African gazelle (Gazella euchore) noted for its
   graceful form and swiftness, and for its peculiar habit of
   springing lightly and suddenly into the air. It has a white
   dorsal stripe, expanding into a broad patch of white on the
   rump and tail. Called also springer. [Written also
   springboc, and springbock.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Antidorcas \Antidorcas\ prop. n.
   A genus of mammals comprising the springbucks (or
   springboks). The main species is Antidorcas marsupialis the
   springbuck, of which there are three subspecies: the cape
   springbuck (marsupialis), the Kalahari springbuck (hofmeyri)
   and the Angolan springbuck (angolensis).

   Syn: genus Antidorcas.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

springbuck
    n 1: a South African gazelle noted for springing lightly into
         the air [syn: springbok, springbuck, Antidorcas
         marsupialis, Antidorcas euchore]