Part of speech: noun

A division- piece between window- lights or panels.

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Usage examples "mullion":

  1. But wishing to be silent as possible, I knotted two blankets together, and strapping the end round the window mullion, swung myself down by one hand, holding my boots in the other. - "The Splendid Spur", Arthur T. Quiller Couch.
  2. The two young ladies went off to inspect the mullion chamber, which they found so crammed with Hillside furniture that they could scarcely enter, and returned disappointed, except for having inspected and admired all Griff's weapons, especially what Miss Fordyce called the sword of her rescue. - "Chantry House", Charlotte M. Yonge.
  3. " Then we'll go to Mullion," I said. - "The Birthright", Joseph Hocking.