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ethynodiol

(ĕ-thī′nə-dīôl′, -ōl′)
n.
  1. A semisynthetic steroid having similar biophysiological effects as progesterone and administered with an estrogen as an oral contraceptive.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.