mullion

noun mul·lion \ 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

Recent Examples of mullion from the Web

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Origin and Etymology of mullion

probably alteration of monial mullion


MULLION Defined for English Language Learners

mullion

noun

Definition of mullion for English Language Learners

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


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