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waterbed

[waw-ter-bed, wot-er-] /ˈwɔ tərˌbɛd, ˈwɒt ər-/
noun
1.
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
1835-1845
1835-45; water + bed
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for water-bed

waterbed

n.

1610s, "a bed on board a ship," from water (n.1) + bed (n.). 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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8
8
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