mullion

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noun mul·lion \ˈməl-yən\

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 and Etymology of mullion

probably alteration of monial mullion


First Known Use: 1567


MULLION Defined for English Language Learners

mullion

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noun mul·lion \ˈməl-yən\

Definition of mullion for English Language Learners

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


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