|akrə|mad.ik, -rō, -atik, -ēk adjective
Etymology: Greek achrōmatos + English -ic
1. : free from color : refracting light without dispersing it into its constituent colors : giving images practically free from extraneous colors
an achromatic telescope
an achromatic microscope objective
2. biology : uncolored : not readily colored by the usual staining agents
achromatic part of a cell
— see achromatic figure
3.
a. : possessing no hue : totally lacking in saturation : neutral
b. : black, gray, or white
4. music : without accidentals or modulation : diatonic
• ach·ro·mat·i·cal·ly -ə̇k(ə)lē, -ēk-, -li adverb