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virus (n.)

late 14c., "poisonous substance," from Latin virus "poison, sap of plants, slimy liquid, a potent juice," from Proto-Italic *weis-o-(s-) "poison," which is probably from a PIE root *ueis-, perhaps originally meaning "to melt away, to flow," used of foul or malodorous fluids, but with specialization in some languages to "poisonous fluid" (source also of Sanskrit visam "venom, poison," visah "poisonous;" Avestan vish- "poison;" Latin viscum "sticky substance, birdlime;" Greek ios "poison," ixos "mistletoe, birdlime;" Old Church Slavonic višnja "cherry;" Old Irish fi "poison;" Welsh gwy "poison"). The meaning "agent that causes infectious disease" is recorded by 1728 (in reference to venereal disease); the modern scientific use dates to the 1880s. The computer sense is from 1972.

Origin and meaning of virus

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Definitions of virus from WordNet

virus (n.)
(virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein;
virus (n.)
a harmful or corrupting agency;
the virus of jealousy is latent in everyone
bigotry is a virus that must not be allowed to spread
virus (n.)
a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer;
a true virus cannot spread to another computer without human assistance
Synonyms: computer virus
From wordnet.princeton.edu