Hydrodynamical | { } a. [ Hydro-, 1 + dynamic, -ical: cf. F. hydrodynamique. ] Pertaining to, or derived from, the dynamical action of water of a liquid; of or pertaining to water power. [ 1913 Webster ] Hydrodynamic friction, friction produced by the viscosity of a liquid in motion. [ 1913 Webster ] Variants: Hydrodynamic |