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mullion

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noun mul·lion \ˈməl-yən\

Simple Definition of mullion

  • : an upright piece of wood, stone, metal, etc., that separates two windows

Source: Merriam-Webster's Learner's Dictionary

Full Definition of mullion

  1. :  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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