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poliosis in Medicine

poliosis

(pō′lē-ōsĭs)
n.
  1. An absence or lessening of melanin in hair of the scalp, brows, or lashes.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.