achromatic
American Heritage Dictionary:
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ach·ro·mat·ic
(ăk'rə-măt'ĭk) 
adj.
achromatism a·chro'ma·tism (ā-krō'mə-tĭz'əm) or a·chro'ma·tic'i·ty (-tĭs'ĭ-tē) n.
adj.
- Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.
- Refracting light without spectral color separation.
- Biology. Difficult to stain with standard dyes. Used in reference to cells or tissues.
- Music. Having only the diatonic tones of the scale.
[From Greek akhrōmatos : a-, without; see a-1 + khrōma, khrōmat-, color.]
achromatically ach'ro·mat'i·cal·ly adv.achromatism a·chro'ma·tism (ā-krō'mə-tĭz'əm) or a·chro'ma·tic'i·ty (-tĭs'ĭ-tē) n.
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Said of architecture that is without color, for example, the white buildings of Greek Revival.
Obscure Words:
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achromatic
refracting light without dispersion; not readily colored; neutral; diatonic
Saunders Veterinary Dictionary:
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achromatism
The quality or the condition of being achromatic; staining with difficulty.
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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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McGraw-Hill Dictionary of Architecture & Construction
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.
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Saunders Veterinary Dictionary
Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.
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