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Mullion
A mullion is a vertical element that forms a division between units of a window or screen, or is used decoratively.[1] It is also often used as a division between double doors. When dividing adjacent window units its primary purpose is a rigid support to the glazing of the window. Its secondary purpose is to provide structural support to an arch or lintel above the window opening. Horizontal elements separating the head of a door from a window above are called transoms.
- ^ "Definition of MULLION". www.merriam-webster.com. Retrieved 2017-09-20.
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