![](https://webarchive.library.unt.edu/eot2008/20090116012319im_/http://www.cancer.gov/images/spacer.gif) |
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![](https://webarchive.library.unt.edu/eot2008/20090116012319im_/http://www.cancer.gov/images/spacer.gif)
| In medicine, something that prevents or protects. |
Previous Definitions: | prolymphocytic leukemia, Promacta, promegapoietin, ProMune, promyelocytic leukemia | Next Definitions: | prophylactic cranial irradiation, prophylactic mastectomy, prophylactic oophorectomy, prophylactic surgery, prophylaxis |
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![](https://webarchive.library.unt.edu/eot2008/20090116012319im_/http://www.cancer.gov/images/spacer.gif) |