Noun
The branch of science which relates to the pressure and equilibrium of nonelastic fluids, as water, mercury, etc.; the principles of statics applied to water and other liquids.
Source: Webster's dictionaryBook 2 also discusses (in Section 5 ) hydrostatics and the properties of compressible fluids. Source: Internet
The combination of the dynamic approach with Archimedean hydrostatics gave birth to a direction in science which may be called medieval hydrodynamics. Source: Internet