Lucarne
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In architecture, a lucarne is a dormer window in a spire or industrial building.
Camden Malthouse (left) and Camden Mill (1880) beyond, Bath
The spire of St Mary Redcliffe, Bristol, has three tiers of lucarnes.
Detail of a lucarne on the spire of St Mary's Church, Queniborough, Leicestershire
College Hill, Shrewsbury
Dormer
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A dormer is a roofed structure, often containing a window, that projects vertically beyond the plane of a pitched roof. A dormer window is a form of roof window.
Lucarne
…In architecture, a lucarne is a dormer window in a spire or industrial building. The term, "lucarne", is borrowed from French: lucarne, which refers to a dormer window, usually one set into the…
Dormer window of the Building of Préfecture de police de Paris (île de la Cité)
Gable dormers at Hospices de Beaune in Beaune, France
Pair of hip roof dormer windows on the Howard Memorial Hall, Letchworth
Gable-fronted dormer (shallow instance wholly glazed)