[waw-ter-bed, wot-er-]
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.

1835–45; water + bed

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1615, "a bed on board a ship," from water (n.1) + bed. As a water-tight mattress filled with water, it is recorded from 1844, originally for invalids. Reinvented c.1970 as a hip furnishing.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If you have one of those silent guzzlers, a waterbed, make your bed today.
If you have a waterbed, set the heater at the lowest comfortable temperature.
Place an insulation board under the heated waterbed.
Program benefits include possible replacement of your refrigerator and/or waterbed mattress with a regular mattress.
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