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[muhl-yuh n] /ˈmʌl yən/ Architecture
a vertical member, as of stone or wood, between the lights of a window, the panels in wainscoting, or the like.
one of the radiating bars of a rose window or the like.
verb (used with object)
to furnish with, or to form into divisions by the use of, mullions.
Origin of mullion
First recorded in 1560-70; metathetic variant of monial
Related forms
unmullioned, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for mullioned
Historical Examples
  • Over these also are mullioned windows with blank interstices.

  • But these also were mullioned, and the entire frontage of the house was uniform in its style.

    The Small House at Allington

    Anthony Trollope
  • The mullioned windows were so constructed that no one could enter through them.

    The Coming of the King James Hocking
  • Beside this archway was a mullioned window with latticed panes.

    Glories of Spain Charles W. Wood
  • Here was the open landscape in front of the mullioned windows.

    Hard Pressed Fred M. White
  • The house is white and has small, mullioned windows with iron bars.

    The Road to Damascus August Strindberg
  • I expect to see you like a gable-end, with a couple of mullioned windows for eyes, and a mouth.

  • Let him produce his pencils and his tablet at a pointed arch or mullioned window, or catch us in absurd posture as we travel.

    Hints to Pilgrims Charles Stephen Brooks
  • The windows in the red castle are of thick, dark glass and are grated and mullioned and set about with iron.

    My Friend Annabel Lee Mary MacLane
  • Between the mullioned windows were old Venetian mirrors and seventeenth-century chairs.

    Masques & Phases Robert Ross
British Dictionary definitions for mullioned


a vertical member between the casements or panes of a window or the panels of a screen
one of the ribs on a rock face
(transitive) to furnish (a window, screen, etc) with mullions
Word Origin
C16: variant of Middle English munial, from Old French moinel, of unknown origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for mullioned



"vertical column between the lights of a window," 1560s, metathesis of Middle English moyniel (early 14c.), from Anglo-French moinel, noun use of moienel (adj.) "middle," from Old French meien "intermediate, mean" (see mean (adj.)). Related: Mullioned.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for mullioned



An unattractive person: Either you're a mullion, a dog

[1970s+ Baseball; origin unknown]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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