[muhl-yuh n]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 formsun·mul·lioned, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mullioned

Historical Examples of mullioned

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

  • At the right of it is a china closet with mullioned glass door, and on the left two narrower closets are found in the paneling.

    Remodeled Farmhouses

    Mary H. Northend

  • On the landing of the staircase stood a boy of eleven or twelve years of age, looking sadly out of the mullioned window.

    The Court Jester

    Cornelia Baker

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

  • A large, low room with a mullioned window at the back through which moonlight steals.

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


(tr) to furnish (a window, screen, etc) with mullions

Word Origin for mullion

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

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