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virus

 
 
/ˈvaɪərəs/ noun [C]

Definition

ILLNESS an infectious organism too small to be seen that causes disease, or an illness that it causes: The doctor says I've got a virus.
COMPUTER a program that is secretly put onto a computer in order to destroy the information that is stored on it
(Definition of virus noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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