Definition: chiaroscuro

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Source: WordNet (r) 1.7 

chiaroscuro
     n : a monochrome picture made by using several different shades
         of the same color

Source: Webster's Revised Unabridged Dictionary (1913) 

Chiaroscuro \Chia`ro*scu"ro\, Chiaro-oscuro \Chi*a"ro-os*cu"ro\,
   n. [It., clear dark.]
   (a) The arrangement of light and dark parts in a work of art,
       such as a drawing or painting, whether in monochrome or
       in color.
   (b) The art or practice of so arranging the light and dark
       parts as to produce a harmonious effect. Cf.
       Clair-obscur.