mullion

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mullion

(mŭl`yən), in architecture, a slender, upright intermediate member that subdivides an opening, as a division between panes of a window or between adjacent windows. Although the mullion occurs in some form in nearly all architectural styles, it is perhaps most characteristic of the elaborate Gothic systems of stone tracerytracery,
bands or bars of stone, wood, or other material, either subdividing an opening or standing in relief against a wall and forming an ornamental pattern of solid members and open spaces.
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Mullion

A dividing piece between the lights of windows, usually taking on the characteristics of the style of the building.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

mullion

[′məl·yən]
(building construction)
A vertical bar separating two windows in a multiple window.
(geology)
In folded sedimentary and metamorphic rocks, a columnar structure in which the rock columns seem to intersect.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

mullion

mullions: a
A vertical member separating (and often supporting) windows, doors, or panels set in series. also see door mullion.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

mullion

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005