poxvirus
noun
pox·vi·rus
ˈpäks-ˌvī-rəs
: any of a family (Poxviridae) of brick-shaped or ovoid double-stranded DNA viruses that have a surface lipoprotein membrane covered with tubular or globular structures and that include the vaccinia virus and the causative agents of cowpox, myxomatosis of rabbits, and smallpox
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Merriam-Webster unabridged
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