grisaille Syllabification: (gri·saille)Pronunciation: /griˈzī, -ˈzāl/Definition of grisaille noun Art a method of painting in gray monochrome, typically to imitate sculpture. a painting or stained-glass window in grisaille style. Origin: mid 19th century: French, from gris 'gray'grisaille in other Oxford dictionaries Definition of grisaille in the British & World English dictionary