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English definition of “virus”

virus

noun [C] (DISEASE)    /ˈvaɪə.rəs/ US  /ˈvaɪ-/
B2 an extremely small piece of organic material that causes disease in humans , animals , and plants : a chickenpox / flu / herpes / mumps virus Evidence suggested that the AIDS virus was spreading very quickly among the heterosexual community .Bacteria, moulds, germs and viruses B2 a disease caused by a virus: I don't know exactly what's wrong with her - I think it's some sort of virus.Disease and illness - general words
(Definition of virus noun (DISEASE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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