dormer

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dormer. Projecting framed structure set vertically on the rafters of a pitched roof, with its own roof (pitched or flat), sides (dormer cheeks), and a window set vertically in the front. It will often have a small gable or pediment (dormer-head) over the window if the roof is pitched at right angles to the main roof, but if the roof is a cat-slide it will have a flat top. Not to be confused with a lucarne rising directly over the eaves from the naked of the main wall below.

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