mul·lion
/ˈməly(ə)n/
noun
a vertical bar between the panes of glass in a window.
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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. It is also often used as a division between double doors. When dividing adjacent window units its primary purpose is a rigid... Wikipedia
6 days ago · The meaning of MULLION is a slender vertical member that forms a division between units of a window, door, or screen or is used ...
MULLION meaning: 1. a narrow vertical bar between the panes (= pieces) of glass in a window: 2. a narrow vertical…. Learn more.