| Definitions | noun (pl=viruses)
- (archaic) venom, Venom, as produced by a poisonous animal etc.
- (context, pathology, microbiology, virology) A submicroscopic infectious organism, now understood to be a non-cellular structure consisting of a core of DNA or RNA surrounded by a protein coat that requires a living cell to replicate — often causes disease in the host organism.
- 2001: Viruses are the smallest and most simplified forms of life. " Leslie Iversen, Drugs: A Very Short Introduction (Oxford 2001, p. 64)
- (computing) A computer virus.
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Etymology: From (term, virus, , poison, slime, venom, lang=la).
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