Meaning of duotone

du•o•tone

Pronunciation: (d'u-tōn", dy'-), [key]
— adj.
  1. of two tones or colors.
—n.
  1. a picture in two tones or colors.
    1. a method of printing an illustration either in a dark and a tinted shade of the same color or in two different colors from two plates of a monochrome original made from negatives at different screen angles.
    2. an illustration printed by this method.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.