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
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.