apochromatic

American

[ap-uh-kroh-mat-ik, -oh-kruh-] / ˌæp ə kroʊˈmæt ɪk, -oʊ krə- /

adjective

Optics.

corrected for spherical aberration at two wavelengths or colors and for chromatic aberration at three wavelengths.

apochromatic British

/ ˌæpəkrəˈmætɪk, ˌæpəˈkrəʊməˌtɪzəm /

adjective

(of a lens) almost free from spherical and chromatic aberration

"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

Other Word Forms

Derived Forms

apochromatism

noun

Etymology

Origin of apochromatic

First recorded in 1885–90; apo- + chromatic

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In consequence of its low refractive and dispersive power, colourless pellucid fluor-spar is valuable in the construction of apochromatic lenses, but this variety is rare.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various

Threads up to about one twenty-thousandth of an inch in diameter may be sufficiently well measured by means of a Zeiss "4 centimetre apochromatic object-glass" and an eyepiece "No. 6" with sixteen centimetre tube length.

From On Laboratory Arts by Threlfall, Richard

The best telescope objectives, and photographic objectives intended for three-colour work, are also apochromatic, even if they do not possess quite the same quality of correction as microscope objectives do.

From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023