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iridodilator

(ĭr′ĭ-dō-dī-lātər, -dīlā′-, -dĭ-lā-, ī′rĭ-)
n.
  1. The dilator muscle of the pupil.
  2. An agent that causes dilation 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.