buckhorn \ˈ ̷ ̷ˌ ̷ ̷\noun Etymology: Middle English, from buck + horn 1.: the horn of a buck; often: the substance of such a horn < knives with buckhorn handles > 2.: deerhorn 2 3. a.: cinnamon fern b.alsobuckhorn plantain: any of several plantains having leaves that suggest a buck's horn in shape; especially: the common ribgrass (Plantago lanceolata)