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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
1560-70; metathetic variant of monial
Related forms
unmullioned, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for mullion
Historical Examples
  • There is a second arch within, which is really divided by a mullion or small pillar.

  • I discovered, too, that Tamsin had ridden from Kynance to mullion on horseback.

    The Birthright Joseph Hocking
  • It seems he has come specially from mullion in Cornwall to be present this afternoon.

    The Drunkard Cyril Arthur Edward Ranger Gull
  • In the tracery beneath, at the head of the mullion, was a statue.

  • She had been once to Cornwall, to mullion and it had been just like that!

    Fortitude Hugh Walpole
  • They are square-headed, and divided by a mullion and transom.

  • The upper part is arched, and down the centre of the arch runs a mullion.

  • The mullion flew asunder; a quatrefoil shifted a little, robbed of its support.

    Peccavi E. W. Hornung
  • Don't you think you ought to have lived on in mullion House?

    The Way of Ambition Robert Hichens
  • The end of the ram smote the mullion fairly and powerfully, where it was already cracked.

    Peccavi E. W. Hornung
British Dictionary definitions for mullion


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 mullion

"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 mullion



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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