WordReference Random House Unabridged Dictionary of American English © 2020
warming pan′, 
  • a long-handled, covered pan, usually of brass, filled with live coals or hot water for warming a cold bed.
    • 1565–75

    Collins Concise English Dictionary © HarperCollins Publishers::
    warming pan n
    1. a pan, often of copper and having a long handle, filled with hot coals or hot water and formerly drawn over the sheets to warm a bed

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