mullion

American  

[muhl-yuhn] / ˈmʌl yən /

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.

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verb (used with object)

1. to furnish with, or to form into divisions by the use of, mullions.

mullion British  

/ 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

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verb

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

Other Word Forms

• unmullioned adjective

Etymology

Origin of mullion

First recorded in 1560–70; metathetic variant of monial

Example Sentences

It continues: “The cottage exudes old world charm with wooden walls, built-in bookshelves, a window with diamond mullions, and many nooks and crannies while still offering modern amenities for today’s living.”

From MarketWatch

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