mullion

Meanings

1. 1
   noun

   a slender upright bar that divides adjacent panes or sections of a window, door, or screen

   Stone mullions divided the tall window into three narrow lights.

2. 2
   verb

   to divide or furnish a window, door, or screen with mullions

   The architect mullioned the broad opening to match the older windows.

Probably an alteration of monial, an older architectural term, or a metathesized form of Middle English moyniel, both ultimately from Old French. The word first named the upright divisions of traceried windows and later broadened to doors and screens.

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