Mullion
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A mullion is the element that forms a division between units of a window or screen, or is used decoratively. When dividing adjacent window units its primary purpose is a rigid support to the glazing o
A mullioned window in the church of San Francesco of Lodi, Lombardy
Bifora (architecture)
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In architecture, a bifora is a type of window divided vertically into two openings by a small column or a mullion or a pilaster; the openings are topped by arches, round or pointed. Sometimes the bifo
Mullion
…Horizontal elements separating the head of a door from a window above are called transoms). In the case of multiple arched windows combined building a bifora (or trifora, etc), the equally shaped windows might be coupled by mullions (instead of a column with base and capital), framed by a blind arch or the…
11th-century monastery of Hosios Loukas in Greece, representative of Byzantine style under the Macedonian dynasty
Alhambra, Granada
A Gothic bifora, Bochum-Stiepel (Germany)