a fleet, antelopelike ruminant, Antilocapra americana, of the plains of western North America: now greatly reduced in number and endangered in some areas.
prong·horn (prông'hôrn', prŏng'-) n.
pl.pronghorn or prong·horns A small ruminant mammal (Antilocapra americana) resembling an antelope and having small forked horns, found on western North American plains. Also called pronghorn antelope.