![](https://webarchive.library.unt.edu/eot2008/20090514041835im_/http://www.cancer.gov/images/spacer.gif) |
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(PYOO-pil)
![](https://webarchive.library.unt.edu/eot2008/20090514041835im_/http://www.cancer.gov/images/spacer.gif)
| The round opening in the center of the iris (the colored tissue that makes the "eye color" at the front of the eye). The pupil changes size to let light into the eye. It gets smaller in bright light and larger as the amount of light decreases. |
Previous Definitions: | pulmonary sulcus tumor, pulmonologist, Pulmozyme, pump, punch biopsy | Next Definitions: | Purinethol, purple clover, purple coneflower, PUVA therapy, PV701 |
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![](https://webarchive.library.unt.edu/eot2008/20090514041835im_/http://www.cancer.gov/images/spacer.gif) |