pupil

Pronunciation: (PYOO-pul)

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.

Definition from: Cancer.gov

Anatomy of the eye, showing the outside and inside of the eye including the eyelid, pupil, sclera, iris, cornea, lens, ciliary body, retina, choroid, vitreous humor, and optic nerve. Anatomía del ojo; se muestra el exterior e interior del ojo con el párpado, la pupila, la esclerótica, el iris, la cornea, el lente, el cuerpo ciliar, la coroides, la retina, el humor vítreo y el nervio óptico.2007-10-04 Date last modified: 2007-10-08