noun (used with a singular verb)
- an applied science dealing with the basic principles of gaseous and liquid matter.
- (functioning as singular) the study of the mechanical and flow properties of fluids, esp as they apply to practical engineeringAlso called: hydraulics See also hydrodynamics, hydrostatics, hydrokinetics
- The scientific study of the mechanical properties of fluids, especially their behavior when subject to internal and external forces. Compare aerodynamics hydrodynamics.