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achromatic

adjective

  1. colorless
  2. refracting white light without breaking it up into its component colors
  3. forming visual images whose outline is free from prismatic colors: an achromatic lens
  4. Biol.
    1. staining poorly with the usual stains
    2. made of achromatin
  5. Music without accidentals; diatonic: an achromatic scale

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See achromatic in American Heritage Dictionary 4

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