GNU Collaborative International Dictionary of English

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1.       
   { ‖Chiaroscuro , ‖Chiaro-oscuro , } 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.
   1913 Webster