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Argyll Robertson pupil

(är-gīl rŏbərt-sən)
n.
  1. A pupil that contracts or expands to accommodate changes in focal length but does not respond to light.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.