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Noun: hot-water bag
Usage: N. Amer (elsewhere: hot-water bottle)
  1. A stoppered receptacle (usually made of rubber) that is to be filled with hot water and used for warming a bed or parts of the body
    "The nurse provided a hot-water bag to soothe the patient's sore muscles";
    - hot-water bottle, hottie [informal], hotty [informal]

Derived forms: hot-water bags

Type of: receptacle