Definition of flavivirus
: any of a family (Flaviviridae and especially genus Flavivirus) of single-stranded RNA viruses transmitted especially by ticks and mosquitoes and including the causative agents of dengue, hepatitis C, hog cholera, Saint Louis encephalitis, West Nile virus, and yellow fever
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Merriam-Webster unabridged
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Time Traveler for flavivirus
The first known use of flavivirus was in 1974
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