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⠀⠀  ⠀⠀⠀  ⠀achromatic
          	⠀⠀  adjective
          	⠀⠀  ⠀⠀⠀  ⠀⠀⠀  ⠀⠀⠀  ⠀relating to, employing, or denoting lenses that transmit light without separating it into constituent colors.