- a bed having a liquid-filled rubber or plastic mattress in a rigid, often heated, waterproof frame, and providing a surface that conforms to the sleeper's body in any position.
Origin of waterbed
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a waterproof mattress filled with water
Word Origin and History for water bed
Online Etymology Dictionary, © 2010 Douglas Harper