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viral (adj.)

"of the nature of, or caused by, a virus," 1944, see virus + -al (1). Sense of "become suddenly widely popular through internet sharing" is attested by 1999, originally in reference to marketing and based on the similarity of the effect to the spread of a computer virus. Related: Virally.

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Definitions of viral

viral (adj.)
relating to or caused by a virus;
viral infection
From wordnet.princeton.edu