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  • noun
    plural -ruses
    [count] an extremely small living thing that causes a disease and that spreads from one person or animal to another
    the AIDS virus = the virus that causes AIDS
    Is the illness caused by bacteria or a virus?
    a disease or illness caused by a virus :a viral disease
    a stomach virus
    computers :a program that is designed to harm a computer by deleting data, ruining files, etc., and that can be spread secretly from one computer to another