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(General Physics) physics colour, such as white, black, and grey, that is devoid of hue. See colour2
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|Noun||1.||achromatic colour - a color lacking hue; white or grey or black|
color, coloring, colouring, colour - a visual attribute of things that results from the light they emit or transmit or reflect; "a white color is made up of many different wavelengths of light"
black, blackness, inkiness - the quality or state of the achromatic color of least lightness (bearing the least resemblance to white)
whiteness, white - the quality or state of the achromatic color of greatest lightness (bearing the least resemblance to black)