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 cabrée, cabut, prongbuck, and pronghorned antelope.

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