water bed

waterbed

[waw-ter-bed, wot-er-]
noun
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:
1835–45; water + bed

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World English Dictionary
water bed
 
n
a waterproof mattress filled with water

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

waterbed
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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