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Use "mullioned" in a sentence
"From the mullioned window of her bedchamber at Windsor Castle, she could see those famous playing fields of Eton just across the Thames."
"Early in the morning, the shutters are closed behind the mullioned windows and no amount of knocking will bring anyone to the door."
"The rooms are small—except for the disproportionately huge rectangular dining room—and need work, but possess charm: uneven floorboards, crumbly thick moulding, lumpy mullioned windows, and a creaky stairway."