- freedom from color.
- freedom from chromatic aberration, as in an achromatic lens.
Origin of achromatism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for achromatism
The achromatism of prisms depends upon the same principles, and it is effected in the same way as that of lenses.
As the diameter of the lens was so small in comparison with its focal length, its want of achromatism was inappreciable.Experimental Determination of the Velocity of Light
Albert A. Michelson
The reflecting telescope was invented; the recognized possibility of achromatism led to an improvement in the refractor.History of the Intellectual Development of Europe, Volume II (of 2)
John William Draper
It would seem that the eye is but little sensitive to colours thus presented, perhaps on account of its own want of achromatism.
It is upon this principle that the achromatism of the image is produced, the different colored rays being united into one focus.Reminiscences of Glass-making
- The quality of being achromatic.
- 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.