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 (ăk′rə-măt′ĭk, ā′krə-)
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·tic′i·ty (-tĭs′ĭ-tē) n.
a·chro′ma·tism (ā-krō′mə-tĭz′əm) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.achromatism - the visual property of being without chromatic colorachromatism - the visual property of being without chromatic color
visual property - an attribute of vision
achromia - an absence of normal pigmentation especially in the skin (as in albinism) or in red blood cells
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
[section] 3 (1.5a.10-b.9) Short biography of Lord Li's Great Preceptor Lord Peng (Peng jun) with a list of his four assistants (Lord Green Lad, Primordial Lady of the Southern Pole, True Lord of Great Achromatism, and Lord Wang, Commander of the Perfected) and their residences.
The optics were something new for Grubb as, unlike the case for typical visual refractors where only the on-axis performance and achromatism had to be good, the new telescopes had the extra requirement of a large field.
A startling achromatism characterizes Daniella Dooling's second solo at Michael Steinberg, "The Silver Locusts." Through a blanketing yet incomprehensibly profound haze of whiteness appear clear plastic folds cascading from the ceiling like great synthetic waterfalls, their singed, floor-hugging ends belying the initial impression of pristine everyday materials.