- free from color.
- able to emit, transmit, or receive light without separating it into colors.
Biology. (of a cell structure) difficult to stain.
Music. without accidentals or changes in key.
Origin of achromatic
Related formsach·ro·mat·i·cal·ly, adverb
First recorded in 1760–70; a-6
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for achromatic
Historical Examples of achromatic
Achromatic: free from color; tissue that does not stain readily.
An achromatic grating, however, is (rashly speaking) an impossibility.
The bands are then achromatic in the sense that the ordinary telescope is so.
If not, the substitution of an achromatic lens will be of no advantage.
Given the achromatic object-glass, why should not it be divided?
British Dictionary definitions for achromatic
Derived Formsachromatically, adverbachromatism (əˈkrəʊməˌtɪzəm) or achromaticity (əˌkrəʊməˈtɪsɪtɪ), noun
capable of reflecting or refracting light without chromatic aberration
- not staining with standard dyes
- of or relating to achromatin
- involving no sharps or flats
- another word for diatonic
denoting a person who is an achromat
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
Word Origin and History for achromatic
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
Of or relating to color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.
Refracting light without spectral color separation.
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.
Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.