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clark's level in Medicine

Clark's level

(klärks)
n.
  1. Any of four levels that mark the invasion of malignant melanoma through the skin layers to the subcutaneous fat layer, each successive level indicating a worsening prognosis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.