'Pin-hole pupil' definitions:

Definition of 'Pin-hole pupil'

From: GCIDE
  • 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]