Pū'pil1, n.
n. [Fr. pupille, Sp. pupila, Pr., Pg. It., & Lat. pupilla, the pupil of the eye, originally diminutive of Lat. pupa, a girl.] (Anat.) The apple of the eye; the small opening in the iris through which the rays of light pass to the retina. See IRIS.
The minds of some of our statesmen, like the pupil of the human eye, contract themselves the more the stronger light there is shed upon them. T. More.
Pin-hole pupil (Med.), the pupil of the eye when so contracted, as it sometimes is in typhus, as to resemble a pin-hole. Dunglison.