Dictionary

water bed

noun

: a bed that has a mattress which is made of rubber or plastic and is filled with water

Full Definition of WATER BED

:  a bed whose mattress is a watertight bag filled with water

First Known Use of WATER BED

1844
Medical Dictionary

water bed

noun

Medical Definition of WATER BED

:  a bed whose mattress is a plastic bag filled with water—called also hydrostatic bed

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