pronghornPronunciation: /ˈprɒŋhɔːn/ (also pronghorn antelope)Definition of pronghorn noun a deer-like North American mammal with a stocky body, long slim legs, and black horns that are shed and regrown annually. Antilocapra americana, the only member of the family Antilocapridae pronghorn in other Oxford dictionaries Definition of pronghorn in the US English dictionary