![](https://webarchive.library.unt.edu/eot2008/20090514064458im_/http://www.cancer.gov/images/spacer.gif) |
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(SEH-duh-tiv)
![](https://webarchive.library.unt.edu/eot2008/20090514064458im_/http://www.cancer.gov/images/spacer.gif)
| A drug or substance used to calm a person down, relieve anxiety, or help a person sleep. |
Previous Definitions: | second primary cancer, second-line therapy, second-look surgery, secondary cancer, secondhand smoke | Next Definitions: | sedimentation rate, sedoxantrone trihydrochloride, segmental cystectomy, segmental mastectomy, segmental resection |
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![](https://webarchive.library.unt.edu/eot2008/20090514064458im_/http://www.cancer.gov/images/spacer.gif) |