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Noun: achromatic colour
Usage: Brit, Cdn (US: achromatic color)
  1. A colour lacking hue; white, grey or black
    "The artist used only achromatic colours to create a stark, dramatic effect";
    - achromatic color [US]

Derived forms: achromatic colours

Type of: color [US], coloring [US], colour [Brit, Cdn], colouring [Brit, Cdn]

Encyclopedia: Achromatic colour