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pachyonychia congenita

(kən-jĕnĭ-tə)
n.
  1. A hereditary syndrome marked by abnormal thickness and elevation of the nail plates, palmar and plantar hyperkeratosis, and a whitish and glazed tongue due to papillary atrophy.Jadassohn-Lewandowsky syndrome
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.