[ muhl-yuhn ]
See synonyms for: mullioned on

  1. a vertical member, as of stone or wood, between the lights of a window, the panels in wainscoting, or the like.

  2. one of the radiating bars of a rose window or the like.

verb (used with object)
  1. 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

Other words from mullion

  • un·mul·lioned, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use mullion in a sentence

  • Then, in the dining-room, those same eyes rested on the coffered ceiling and the portraits and the wide mullioned lattice.

    Mushroom Town | Oliver Onions
  • The north and south aisles had formerly mullioned windows, which are now walled up.

    Milton's England | Lucia Ames Mead
  • 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
  • A well of moonlight was revealed—a broad, padded seat in front of a tall mullioned window.

    What Will People Say? | Rupert Hughes
  • It had a minstrels' gallery, a big hall and a little hall, mullioned windows and all the rest of it.

    The Gay Cockade | Temple Bailey

British Dictionary definitions for mullion


/ (ˈmʌlɪən) /

  1. a vertical member between the casements or panes of a window or the panels of a screen

  2. one of the ribs on a rock face

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

Origin of 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