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]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "springbok":
   Cape elk, Virginia deer, antelope, buck, camel, camelopard,
   caribou, deer, deerlet, doe, dromedary, eland, elk, fallow deer,
   fawn, gazelle, giraffe, gnu, hart, hartebeest, hind, kaama, moose,
   mule deer, musk deer, okapi, red deer, reindeer, roe, roe deer,
   roebuck, stag, wildebeest