[ waw-ter-bed, wot-er- ]
/ ˈwɔ tərˌbɛd, ˈwɒt ər- /
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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for waterbed
Another novel feature was in the method of controlling the depth of submergence when navigating between the surface and waterbed.Aircraft and Submarines|Willis J. Abbot.
Built to further demonstrate the possibility of navigation over the waterbed of seas or the ocean.The Submarine in War and Peace|Simon Lake