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2017 Word of the Year

achromatism

[ey-kroh-muh-tiz-uh m] /eɪˈkroʊ məˌtɪz əm/
noun, Optics.
1.
freedom from color.
2.
freedom from chromatic aberration, as in an achromatic lens.
Also, achromaticity.
Origin of achromatism
1790-1800
First recorded in 1790-1800; achromat(ic) + -ism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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achromatism in Medicine

achromatism a·chro·ma·tism (ā-krō'mə-tĭz'əm, ə-krō'-)
n.

  1. The quality of being achromatic.

  2. The correction of chromatic aberration by combining lenses of different refractive indexes and different dispersion.

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