noun Date: 1798 a mild eruptive disease of the cow that is caused by a poxvirus (species Cowpox virus of the genus Orthopoxvirus ) and that when communicated to humans protects against smallpox
COWPOX
Meaning of COWPOX in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012