rotavirus
noun
ro·ta·vi·rus
ˈrō-tə-ˌvī-rəs
: any of a genus (Rotavirus) of reoviruses that have a three-layered protein capsid with no outer lipid envelope when mature and that include one (species Rotavirus A) causing epidemics of severe and sometimes fatal diarrhea in infants and young children
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Merriam-Webster unabridged
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