![](https://webarchive.library.unt.edu/eot2008/20081103011151im_/http://www.nci.nih.gov/images/spacer.gif) |
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(VY-rus)
![](https://webarchive.library.unt.edu/eot2008/20081103011151im_/http://www.nci.nih.gov/images/spacer.gif)
| 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. |
Previous Definitions: | virotherapy, virtual colonoscopy, virulence, virulent, Virulizin | Next Definitions: | virus replication cycle, virus-neutralizing antibody, viscera, visceral, visceral peritoneum |
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![](https://webarchive.library.unt.edu/eot2008/20081103011151im_/http://www.nci.nih.gov/images/spacer.gif) |