Nikolsky's sign

[nĭ-kŏlskēz]
n.
  1. An indication of pemphigus vulgaris in which apparently normal epidermis may be separated at the basal layer and rubbed off when pressed with a sliding motion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.