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achromatic

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ach⋅ro⋅mat⋅ic

  [ak-ruh-mat-ik, ey-kruh-]
Use achromatic in a Sentence
–adjective
1. Optics.
a. free from color.
b. 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:
1760–70; a- 6 + chromatic

Related forms:
ach⋅ro⋅mat⋅i⋅cal⋅ly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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LaCroix Optical
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ach·ro·mat·ic   (āk'rə-māt'ĭk)   
adj.  

  1. Designating 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. Biology Difficult to stain with standard dyes. Used in reference to cells or tissues.

  4. Music Having only the diatonic tones of the scale.


[From Greek akhrōmatos : a-, without; see a-1 + khrōma, khrōmat-, color.]
ach'ro·mat'i·cal·ly adv., a·chro'ma·tism (ā-krō'mə-tĭz'əm), a·chro'ma·tic'i·ty (-tĭs'ĭ-tē) n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: ach·ro·mat·ic
Pronunciation: "ak-r&-'mat-ik
Function: adjective
1 : refracting light without dispersing it intoits constituent colors : giving images practically free from extraneous colors achromatic telescope>
2 : not readily colored by the usual staining agents
3 : possessing or involving no hue : being or involving only black, gray, or white <achromatic visual sensations> <achromatic light stimuli> —ach·ro·mat·i·cal·ly /-i-k(&-)lE/ adverb
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

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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