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Definitions for: Virus [n] 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
Webster (1913) Definition: Vi"rus, n. [L., a slimy liquid, a poisonous liquid,
poison, stench; akin to Gr. ? poison, Skr. visha. Cf.
Wizen, v. i.]
1. (Med.)
(a) Contagious or poisonous matter, as of specific ulcers,
the bite of snakes, etc.; -- applied to organic
poisons.
(b) The special contagion, inappreciable to the senses and
acting in exceedingly minute quantities, by which a
disease is introduced into the organism and maintained
there.
Note: The specific virus of diseases is now regarded as a
microscopic living vegetable organism which multiplies
within the body, and, either by its own action or by
the associated development of a chemical poison, causes
the phenomena of the special disease.
2. Fig.: Any morbid corrupting quality in intellectual or
moral conditions; something that poisons the mind or the
soul; as, the virus of obscene books.
See Also: animal virus, bacteriophage, microorganism, phage, plant virus, slow virus, tumor virus
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