Definition of "mullions" [mullions]

• Plural form of mullion. (noun)

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• "Fragments of brick window frames (or "mullions"), diamond-shaped window glass and lead strips spoke of leaded glass windows set in brick plastered to look like stone."
• "Previously, the board used the term "mullions," though the correct term is"
• "The heavy white mullions on the French doors might be prison bars keeping them from the bright world outside."