acromatic Adjective, acromatic achromatic Appox. usage (any sense): 0.012 per million words Appox. usage (any sense): 0.012 per million words
acromat Adjective, acromat achromatic Appox. usage (any sense): less than 0.1 per million words Appox. usage (any sense): less than 0.1 per million words