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• n  a nonstructural vertical strip between the casements or panes of a window (or the panels of a screen)

• It is just possible that before the project is completed it may include a machine-tooled, I-beam mullion from the first of the glass-and-steel box buildings acetylene-torched out .
• But even if Chartres had been pulverized to dust, it could probably be rebuilt exactly, down to the remotest crocket and mullion.