congenital ectodermal defect

n.
  1. Incomplete development of the epidermis and skin appendages, causing the skin to be hairless and sweating to be deficient.congenital ectodermal dysplasia
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.