vaccinia
noun
vac·cin·ia
vak-ˈsi-nē-ə
1
or vaccinia virus
: a poxvirus (species Vaccinia virus of the genus Orthopoxvirus) that differs from but is closely related to the viruses causing smallpox and cowpox and that includes a strain used in making vaccines against smallpox
2
: a reaction to smallpox vaccine prepared from live vaccinia virus that may involve a rash, fever, headache, and body pain
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Merriam-Webster unabridged
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