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A kind of mattress made of, or covered with, waterproof fabric and filled with water. It is used in hospitals for bedridden patients.

n water, for the purpose of ascertaining their specific gravities. -- Hydrostatic bed, a water bed. -- Hydrostatic bellows, an apparatus consisting of a water-tight bellowslike case with a long, upright tube, into which water may be poured to illustrate the hydrostatic paradox. -- Hydrostatic paradox, the propositio…