GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Water bed (?). A kind of mattress made of, or covered with, waterproof fabric and filled with water, thus providing uniform support to the body lying on it; -- also a bed constructed so as to contain such a mattress. It is used in hospitals for bedridden patients, as well as in some private homes.
   
   [1913 Webster +PJC]