I. vi‧ral1 /ˈvaɪərəl $ ˈvaɪrəl/
adjective1. relating to or caused by a
virus:
a viral infection2. passed on to other people on the Internet or using
mobile phones:
It is one of the most viewed viral videos on the web. [TahlilGaran] Dictionary of Contemporary English ▲
II. viral2 noun [countable] a viral video, advertisement etc:
They use humorous virals to promote their products. [TahlilGaran] Dictionary of Contemporary English ▲