mullion
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.mul·lion
noun \ˈməl-yən\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
See Origin of MULLION
probably alteration of monial mullion
First Known Use: 1567
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