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tonic pupil in Medicine

tonic pupil

n.
  1. A usually enlarged pupil that responds very slowly to changes in focal length and exposure to light.Piltz sign Westphal-Piltz pupil
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.