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retinoic acid

(rĕt′n-ōĭk)
n.
  1. An acid formed in the oxidation of retinaldehyde and used as a topical treatment for acne.vitamin A acid
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.