The Collaborative International Dictionary
Hydrostat
Hydrostat \Hy"dro*stat\, n.
A contrivance or apparatus to prevent the explosion of steam boilers.
A device, usually electrical, for indicating or regulating the height of water in a reservoir or receptacle.
Wiktionary
hydrostat
n. 1 A mechanism that regulates the amount of water in a boiler 2 (context biology English) A muscle tissue, composed mostly of water, that maintains a constant volume during contraction
Usage examples of "hydrostat".
Although it probably began as a lung, over the course of evolution it has become the swimbladder, an ingenious device with which the fish maintains itself as a hydrostat in permanent equilibrium.