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horner's pupil in Medicine

Horner's pupil

(hôrnərz)
n.
  1. A pupil that is constricted due to impairment of the sympathetic nerve of the dilator muscle of the pupil.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.