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mullion

mullion mŭl´yən [key], 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 tracery .

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.