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achromatic

[ak-ruh-mat-ik, ey-kruh-] /ˌæk rəˈmæt ɪk, ˌeɪ krə-/
adjective
1.
Optics.
  1. free from color.
  2. able to emit, transmit, or receive light without separating it into colors.
2.
Biology. (of a cell structure) difficult to stain.
3.
Music. without accidentals or changes in key.
Origin
1760-1770
1760-70; a-6 + chromatic
Related forms
achromatically, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for more achromatic

achromatic

/ˌækrəˈmætɪk/
adjective
1.
without colour
2.
capable of reflecting or refracting light without chromatic aberration
3.
(cytology)
  1. not staining with standard dyes
  2. of or relating to achromatin
4.
(music)
  1. involving no sharps or flats
  2. another word for diatonic
5.
denoting a person who is an achromat
Derived Forms
achromatically, adverb
achromatism (əˈkrəʊməˌtɪzəm), achromaticity (əˌkrəʊməˈtɪsɪtɪ) noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for more achromatic

achromatic

adj.

1766, from Greek akhromatos "colorless," from a-, privative prefix (see a- (3)), + khromat-, comb. form of khroma "color" (see chroma) + -ic.

Online Etymology Dictionary, © 2010 Douglas Harper
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more achromatic in Medicine

achromatic ach·ro·mat·ic (āk'rə-māt'ĭk)
adj.

  1. Of or relating to color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.

  2. Refracting light without spectral color separation.

  3. Of or relating to cells or tissues difficult to stain with standard dyes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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more achromatic in Science
achromatic
  (āk'rə-māt'ĭk)   
Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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