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[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.
Origin of waterbed
1835-45; water + bed Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for waterbed
  • 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.
Word Origin and History for waterbed

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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