Definition of bunyavirus
: any of an order (Bunyavirales) or former family (Bunyaviridae) of usually spherical or pleomorphic single-stranded RNA viruses usually transmitted by the bite of an arthropod (such as a mosquito) or in the bodily secretions of rodents and including the hantaviruses and the causative agents of Rift Valley fever, sandfly fever, and some forms of encephalitis and hemorrhagic fever
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Merriam-Webster unabridged
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Time Traveler for bunyavirus
The first known use of bunyavirus was in 1973
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