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porokeratosis

(pôr′ō-kĕr′ə-tōsĭs)
n.
  1. A rare dermatosis marked by thickening of the stratum corneum together with progressive centrifugal atrophy.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.