achromatic

/ˌeɪkrəˈmætɪk/
adjective
  1. Free from color; appearing as white, black, or shades of gray.
    • In the photograph, the achromatic background made the red flower stand out dramatically.
    • Achromatic colors like beige and charcoal are popular in modern interior design.
    • The artist chose an achromatic palette of black, white, and gray for the minimalist painting.
  2. Describing a lens or optical system that corrects for chromatic aberration, so that images do not have colored fringes.
    • My new camera lens is achromatic, so the photos have no purple or green edges around bright objects.
    • High-quality microscopes use achromatic objectives to produce clear, color-corrected images.
    • The achromatic eyepiece allowed the astronomer to see the rings of Saturn without blue or red halos.
  3. In music, relating to a scale or passage that uses only the notes of the diatonic scale (without chromatic alteration).
    • The composer wrote an achromatic melody using only the white keys of the piano.
    • The choir sang an achromatic hymn that stayed within a single major key.
    • This simple folk song is entirely achromatic, making it easy for beginners to play.
Antonyms
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