different between achromatic vs achroous

English

From Ancient Greek ???????????? (akhr?mátistos, “uncolored”), from ?- (a-, “not”) + ????? (khrôma, “color”); compare French achromatique

achromatic (comparative more achromatic, superlative most achromatic)

(optics) Free from color; transmitting light without color-related distortion.
Synonyms: see Thesaurus:achromatic
Containing components such as achromatic lenses and prisms, designed to prevent color-related distortion.
(biology) Uncolored; not absorbing color from a fluid; -- said of tissue
(music) Having only the diatonic notes of the scale; not modified by accidentals.
Being achromatic in subject

From Ancient Greek ?????? (ákhroos), from ?- (a-, “not”) + ???? (khr?s, “color”)

achroous

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