D defs.my
Entry 1 sense Webster, 1913

Achromatism

· A·chro·ma·tism · IPA
01 n. The state or quality of being achromatic; as, the achromatism of a lens; achromaticity.
  1. 1.
    The state or quality of being achromatic; as, the achromatism of a lens; achromaticity.