Source : Webster's Revised Unabridged Dictionary (1913)

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}.

   {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.