ach·ro·mat·ic adj \ˌak-rə-ˈmat-ik\
: refracting light without dispersing it into its constituent colors : giving images practically free from extraneous colors <an achromatic telescope>
: not readily colored by the usual staining agents
: possessing or involving no hue : being or involving only black, gray, or white <achromatic visual sensations> <achromatic light stimuli>
—ach·ro·mat·i·cal·ly \-i-k(ə-)lē\ adverb
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