Medical Dictionary


noun vac·cin·ia \vak-ˈsin-ē-ə\

Medical Definition of VACCINIA

a :  cowpox b :  a reaction to smallpox vaccine prepared from live vaccinia virus that may involve a rash, fever, headache, and body pain
:  a poxvirus of the genus Orthopoxvirus (species Vaccinia virus) that differs from but is closely related to the viruses causing smallpox and cowpox and that includes a strain of uncertain natural origin used in making vaccines against smallpox—called also vaccinia virus
vac·cin·i·al \-ē-əl\ adjective


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