Source : Webster's Revised Unabridged Dictionary (1913)

Prongbuck \Prong"buck`\, n. (Zo["o]l.)
      (a) The springbuck.
      (b) The pronghorn.

Source : WordNet®

prongbuck
     n : fleet antelope-like ruminant of western North American
         plains with small branched horns [syn: {pronghorn}, {pronghorn
         antelope}, {American antelope}, {Antilocapra americana}]