First Known Use: 1567
Dictionary
mullion
noun mul·lion \ˈməl-yən\
: an upright piece of wood, stone, metal, etc., that separates two windows
Full Definition of MULLION
: a slender vertical member that forms a division between units of a window, door, or screen or is used decoratively
— mullion transitive verb
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Origin of MULLION
probably alteration of monial mullion
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