[ muhl-yuh n ]
/ ˈmʌl yən /


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.

Nearby words

  1. mulligan,
  2. mulligatawny,
  3. mulligrubs,
  4. mulliken,
  5. mullingar,
  6. mullis,
  7. mullite,
  8. mullock,
  9. mulloway,
  10. mulroney

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 mullion

British Dictionary definitions for mullion


/ (ˈmʌlɪən) /


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 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