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hair disk

n.
  1. A highly innervated area of skin around a hair follicle consisting of a thickened layer of epithelial cells in which unmyelinated terminals of a single axon ramify.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.