Virus
/vˈaɪrəs/
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Definition
(noun) A submicroscopic, non-cellular structure that consists of a core of DNA or RNA surrounded by a protein coat, that requires a living host cell to replicate, and that sometimes causes disease in the host organism (such agents are often classed as nonliving infectious particles and less often as microorganisms).
Sentence Examples
Scientists are fighting to stem the spread of the AIDS virus.
That looks like the work of a virus.
CEFR Practice Quiz
Please make sure that you have a good ____ protection program on your computer to keep your personal data safe today.