noun, plural prong·horns ( especially collectively ) prong·horn.
a fleet, antelopelike ruminant, Antilocapra americana, of the plains of western North America: now greatly reduced in number and endangered in some areas.
Also called: American antelope a ruminant mammal, Antilocapra americana, inhabiting rocky deserts of North America and having small branched horns: family Antilocapridae