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• (VY-rus) In medicine, a very simple microorganism that infects cells and may cause disease. Because viruses can multiply only inside infected cells, they are not considered to be alive.

  National Cancer Institute - Cite This Source - This Definition
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  Cite Definition for Virus

  American Psychological Association (APA)

  Virus. (n.d.). Dictionary of Cancer Terms. Retrieved March 21, 2023, from website: http://www.expertglossary.com/definition/virus.

  Chicago Manual of Style (CMS)

  Virus. www.cancer.gov. Dictionary of Cancer Terms. National Cancer Institute. http://www.expertglossary.com/definition/virus (accessed: March 21, 2023).

  Modern Language Association (MLA)

  "Virus." Dictionary of Cancer Terms. National Cancer Institute. 21 March. 2023 http://www.expertglossary.com/definition/virus.

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