achromatize
American Heritage Dictionary:
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a·chro·ma·tize
(ā-krō'mə-tīz') 
tr.v., -tized, -tiz·ing, -tiz·es.
To rid of color; render achromatic.
tr.v., -tized, -tiz·ing, -tiz·es.
To rid of color; render achromatic.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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