top light
noun
Definitions
The upper (and usually smaller) part (casement) of a window, often hinged a the top
Any glazing above a main window, partition or door
A skylight
Toplighting: light from above
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Definitions
The upper (and usually smaller) part (casement) of a window, often hinged a the top
Any glazing above a main window, partition or door
A skylight
Toplighting: light from above