牛ぎゅう痘とうぎゅうとうMeanings1nouncowpox; vacciniamedicineMedical term for the viral disease in cattle, historically important for smallpox vaccination.牛ぎゅう痘とうウイルスは天てん然ねん痘とうワクチンの開かい発はつに利り用ようされた。The cowpox virus was used in the development of the smallpox vaccine.