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. SMART Vocabulary: related words and phrases (Définition de viral depuis le Dictionnaire Cambridge Advanced Learner's & Thesaurus © Cambridge University Press) «VIRAL» EN ANGLAIS AMÉRICAIN viral adjective [ not gradable ] US / ˈvɑɪ·rəl / BIOLOGY relating to or caused by a virus (Définition de viral depuis le Dictionnaire Cambridge Academic Content © Cambridge University Press) viral DANS LE DICTIONNAIRE ANGLAIS DES AFFAIRES viral adjective INTERNET , MARKETING UK / ˈvaɪr ə l / US spreading or becoming popular very quickly through communication from one person to another, especially on the inter