virus - definition and synonyms

 
 
 
noun [countable] 

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/ˈvaɪrəs/
singularvirus
pluralviruses
  1. 1
    biology a simple living thing that is smaller than bacteria and that can enter your body and make you ill. If your body can protect itself against a particular virus, then you are immune to it. A vaccine is a medicine that makes you immune to a particular virus

    Malaria is caused by a virus carried by mosquitos.

    the AIDS virus

    1. a.
      a disease caused by a virus

      I’ve been in bed all week with a virus.

    See also bacteria
  2. 2
    computing a program that enters your computer and damages or destroys information that you have stored

    Most viruses are spread over the Internet.