Join Us On

Browse Dictionary Browse Thesaurus

Get our free apps!iPhone•iPad•Android

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

What made you want to look up water bed? Please tell us where you read or heard it (including the quote, if possible).

Put-downs with flair

How to use a word that (literally) drives some people nuts.

Test your vocab with our fun, fast game

Ailurophobia, and 9 other unusual fears

Join Us

Merriam-Webster
on Facebook

Merriam-Webster
on Twitter

Bookstore: Digital and Print

Merriam-Webster references for Mobile, Kindle, print, and more.

See All

Other Merriam-Webster Dictionaries