an electrical device for detecting the presence of water, as from overflow or leakage.
any of various devices for preventing injury to a steam boiler when its water sinks below a certain level.

1855–60; hydro-1 + -stat

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World English Dictionary
hydrostat (ˈhaɪdrəʊˌstæt)
a device that detects the presence of water as a prevention against drying out, overflow, etc, esp one used as a warning in a steam boiler

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Example sentences
The arms are composed almost entirely of muscle, with no bone or external skeleton-a structure known as a muscular hydrostat.
Elephant trunks and tongues are other examples of a muscular hydrostat.
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