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junction nevus

n.
  1. A nevus consisting of nests of melanocytes at the junction of the epidermis and dermis that appear as a small, slightly raised, flat, nonhairy, dark-brown or black tumor.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.