Dictionary.com
definitions

bedwarmer

[bed-wawr-mer]
noun
  1. a long-handled, covered pan containing hot coals, used for warming beds.

Origin of bedwarmer

First recorded in 1920–25; bed + warmer
Also called bedpan.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for bedwarmer

bedwarmer

noun
  1. a metal pan containing hot coals, formerly used to warm a bed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012