Waterbed

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

A waterbed, water mattress, or flotation mattress is a bed or mattress filled with water. Waterbeds intended for medical therapies appear in various reports through the 19th century.

Excerpt from the Wikipedia article “Waterbed”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Photographed by Robert Paprstein, Public domain, via Wikimedia Commons.