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Definition of virus:

  1. Contagious or poisonous matter, as of specific ulcers, the bite of snakes, etc.; - applied to organic poisons.
  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.
  3. 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.


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