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Definition of Orthopoxvirus
1. Noun. Any of the genus ''Orthopoxvirus'' of poxviruses, including smallpox and many species isolated from mammals. ¹
¹ Source: wiktionary.com
Medical Definition of Orthopoxvirus
1. A genus of the family poxviridae, subfamily chordopoxvirninae, comprising many species infecting mammals. Viruses of this genus cause generalised infections and a rash in some hosts. The type species is vaccinia virus. (12 Dec 1998)