The Collaborative International Dictionary of English v.0.48:

Pupil \Pu"pil\, n. [F. pupille, n. fem., L. pupilla the pupil of
   the eye, originally dim. of pupa a girl. See Puppet, and
   cf. Pupil a scholar.] (Anat.)
   The aperture in the iris; the sight, apple, or black of the
   eye. See the Note under Eye, and Iris.
   [1913 Webster]

   Pin-hole pupil (Med.), the pupil of the eye when so
      contracted (as it sometimes is in typhus, or opium
      poisoning) as to resemble a pin hole. --Dunglison.
      [1913 Webster]