noun
1. : a highly contagious virus disease of sheep and goats that occurs especially in young animals, is characterized by extensive vesiculation and subsequent ulceration about the lips, gums, and tongue, and rarely ends fatally but interferes with nutrition and may be complicated by secondary bacterial infection — called also contagious ecthyma, scabby mouth
2. : necrobacillosis affecting the mouth ; especially : calf diphtheria