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  1. Dictionary
    Vi·rus
    /ˈvīrəs/

    noun

    • 1. an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host: "the hepatitis B virus"
    • 2. a piece of code that is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data.