achromat

American  

[ak-ruh-mat] / ˈæk rəˌmæt /

noun

1. achromatic lens.

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achromat British  

/ ˈækrəˌmæt /

noun

1. Also called: achromatic lens.  a lens designed to bring light of two chosen wavelengths to the same focal point, thus reducing chromatic aberration Compare apochromat

2. a person who has no colour vision at all and can distinguish only black, white, and grey. The condition is very rare

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Etymology

Origin of achromat

First recorded in 1905–10; by shortening