achromat

achromat

[ak-ruh-mat]

Origin:
1905–10; by shortening

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