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

Origin of MULLION

probably alteration of monial mullion
First Known Use: 1567

Rhymes with MULLION


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