From The Collaborative International Dictionary of English v.0.44 [gcide]:
Chiaroscuro \Chia'ro*scu"ro\, ||Chiaro-oscuro \Chi*a"ro-os*cu"ro\, noun [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}.
From WordNet (r) 2.0 [wn]:
noun
1: a monochrome picture made by using several different shades of the same color
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