achromatism

[ ey-kroh-muh-tiz-uh m ]

/ eɪˈkroʊ məˌtɪz əm /

freedom from color.

freedom from chromatic aberration, as in an achromatic lens.

Also achromaticity.

Origin of achromatism

First recorded in 1790–1800; achromat(ic) + -ism

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
Thus examined, the departure of the eye from achromatism appears very gross indeed.

Six Lectures on Light |John Tyndall
The achromatism of prisms depends upon the same principles, and it is effected in the same way as that of lenses.

Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I |Arnold Cooley
It would seem that the eye is but little sensitive to colours thus presented, perhaps on account of its own want of achromatism.

Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6 |Various

Leonhard Euler in 1747 had suggested that achromatism might be obtained by the combination of glass and water lenses.

Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 |Various

achromatism

[ ā-krō′mə-tĭz′əm, ə-krō′- ]

The quality of being achromatic.

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