Entry 2 senses Webster, 1913 Longhorn /lông'-hôrnˌ/ · Long·horn · IPA /ˈlɔŋhɔɹn/ 01 n. A long-horned animal, as a cow, goat, or beetle. See Long-horned. 1. A long-horned animal, as a cow, goat, or beetle. See Long-horned.(Zool.) See: Long-horned 2. The Texas longhorn. See: Texas longhorn