achromia

Medical Dictionary

achromia a·chro·mi·a (ā-krō'mē-ə, ə-krō'-)
n.

  1. Congenital or acquired deficiency of natural pigmentation.

  2. Lack of capacity to accept stains in cells or tissue. Also called achromasia, achromatosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
achromia

noun
an absence of normal pigmentation especially in the skin (as in albinism) or in red blood cells 
WordNet® 3.0, © 2006 by Princeton University.
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