Adjective jet black has 1 sense
  1. coal-black, jet, jet-black, pitchy, sooty - of the blackest black; similar to the color of jet or coal
    Antonym: chromatic (indirect, via achromatic)
,Noun jet black has 1 sense
  1. coal black, ebony, jet black, pitch black, sable, soot black - a very dark black
    --1 is a kind of black, blackness
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