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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: Pupila

Pupil (PYOO-pil)
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.



 
 
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.