mullion

[ muhl-yuhn ]

noun

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.

mullion

/ ˈmʌlɪən /

noun

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

verb

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

Other Words From

• un·mullioned adjective

Word History and Origins

Origin of mullion¹

First recorded in 1560–70; metathetic variant of monial

Word History and Origins

Origin of mullion¹

C16: variant of Middle English munial, from Old French moinel, of unknown origin

Example Sentences

It is recognised for its stone mullions, canted bay windows, and recessed entrance.

From BBC

And the prominence of the mullions not only adds a formal geometric component but also seems like a defensive barrier that has been pierced.

From New York Times

Soaring windows with ornate mullions frame views of the outdoors.

From Washington Post

Panel doors are connected by “mortise-and-tenon or mitered joints, and mullions that run vertically between the rails.”

From New York Times

At least a third of the open area would be obscured by wide vinyl mullions and rails.

From Washington Post