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; [syn: hot-water bottle, hot-water bag]
WordNet (r) 3.0 (2006):
hot-water bottle
n 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 [syn: hot-water bottle, hot-water
bag]