Pronghorn

from WordNet (r) 3.0 (2006)

pronghorn
    n 1: fleet antelope-like ruminant of western North American
         plains with small branched horns [syn: {pronghorn},
         {prongbuck}, {pronghorn antelope}, {American antelope},
         {Antilocapra americana}]

from The Collaborative International Dictionary of English v.0.48

Pronghorn \Prong"horn`\, n. (Zool.)
   An American antelope ({Antilocapra Americana}), native of the
   plain near the Rocky Mountains. The upper parts are mostly
   yellowish brown; the under parts, the sides of the head and
   throat, and the buttocks, are white. The horny sheath of the
   horns is shed annually. Called also {cabr['e]e}, {cabut},
   {prongbuck}, and {pronghorned antelope}.
   [1913 Webster]