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English definition of “viral”

viral

adjective uk   /ˈvaɪə.rəl/ us    /ˈvaɪ-/

viral adjective (DISEASE)

caused by a virus: viral infectionsBacteria, moulds, germs and virusesDisease and illness - general words

viral adjective (INTERNET)

used to describe something that quickly becomes very popular or well known by being published on the internet or sent from person to person by email, phone, etc.: Here's a list of the top ten viral videos this week. Within days the film clip went viral.
(Definition of viral from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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