different between achromatism vs chromatism

English

Compare French achromatisme.

achromatism (uncountable)

The state or quality of being achromatic; achromaticity.
The state of being free of colors, not emitting or separating into colors.
- 1946, Mervyn Peake, Titus Groan, London: Eyre & Spottiswoode, “Mrs Slagg by Moonlight”
  No flaming flower relieved its black achromatism although that tree had been known long ago to burst open with a three-hour glory.
Achromatopia.

achromatism in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
Dorland's Pocket Medical Dictionary, 22nd edition, W. B. Saunders, 1977

chromato- +? -ism

chromatism (uncountable)

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