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late 14c., "venomous substance," from L. virus" poison, sap of plants, slimy liquid," probably the PIE base *weis- "to melt away, to flow," used of foul or malodorous liquids (cf. Sct. visam "poison," visah "poisonous;" Avestan vish- "poison;" L. viscum "sticky substance, the league;" Gk. ios "poison," ixos "mistletoe, the league; O. C. S. višnja "cherry;" O. Ir. fi "poison;" Welsh gwy "fluid, water," gwyar "blood"). Main modern meaning "agent that causes infectious disease" first recorded 1728. The computer sense is from 1972. Adjective form viral was coined 1948. . Virus: Of etymonline.com