Viral
来自Big Physics
wiktionary
virus + -al From the stem of virus and the suffix -al.
etymonline
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.
