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hyperchromatism

(hī′pər-krōmə-tĭz′əm)
n.
  1. Excessive formation of skin pigment.hyperchromia
  2. A condition in which cells or parts of cells, especially cell nuclei, stain more intensely than normal.hyperchromasia
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Related formshy′per•chro•matic (-krə-mătĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.