When something is without a color or hue, it is achromatic. ... In physics, the word achromatic is a bit more complicated, meaning "able to reflect light without it separating into colors." The Greek root word is akhrōmatikos, "colorless," combining the prefix a,"without," and khrōma, "color."

What does it mean when someone is achromatic?

Achromatic means literally “without color”.

What is achromatic color?

Achromatic colors are qualities like white, grey, black, and the luminous qualities seen in stars and in lamps emitting “white” light.