chromaticity

[ACHROMATIC.] 8. The quality or state of being achromatic. a chrō-mat-ism, 8. [Gr. a, priv.; χρωματισμός (chroma tis mos) = colouring, dyeing.] The quality or state of being achromatic. "The achromatism of the eye may be in part due to the diversity of shape and density of the refractive media, which seem to bear some analogy to the system forming the achromatic object-gla of Herschel."Todd & Bowman. Physiol. Anat ., vol. ii, p. 50.