gri·saille 
(grĭ-zī, -zāl)
(grĭ-zī, -zāl)n.
1. A style of monochromatic painting in shades of gray, used especially for the representation of relief sculpture.
2. A painting or design in this style.
3.
a. Vitrifiable glass paint.
b. A lacy pattern painted on light glass with vitrifiable paint and fired.
[French, from gris, gray, from Old French, from Frankish *grīs.]
grisailledetail of the c. 1375 silk Parament of Narbonne, depicting Queen Joan of Bourbon (1338-1378) praying