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hot-wa·ter bottle(hŏt′wô′tər, -wŏt′ər)
A stoppered container, usually made of plastic or rubber, that is filled with hot water and applied to a part of the body for warmth. Also called hot-water bag.
(Tools) a receptacle, now usually made of rubber, designed to be filled with hot water, used for warming a bed or parts of the body
n → Wärmflasche f