noun
: an inner frame (as a wooden framework) built especially for a stage production to mask lighting equipment or narrow the stage opening or by means of special shape to give a desired design-quality to the production
noun
: an inner frame (as a wooden framework) built especially for a stage production to mask lighting equipment or narrow the stage opening or by means of special shape to give a desired design-quality to the production
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012