Source : Webster's Revised Unabridged Dictionary (1913)

Grisaille \Gri"saille`\, n. [F., from gris gray.]
   1. (Fine Arts) Decorative painting in gray monochrome; --
      used in English especially for painted glass.

   2. A kind of French fancy dress goods. --Knight.

Source : WordNet®

grisaille
     n : chiaroscuro painting or stained glass etc., in shades of
         gray imitating the effect of relief