Hy'dro-dy-năm'ics, n. sing.

n. sing. [Gr. ὕδωρ, water, and dynamics, q. v.; Fr. hydrodynamique.] That branch of the science of mechanics which relates to fluids, or, as usually limited, which treats of the laws of motion and action of non-elastic fluids, whether as investigated mathematically, or by observation and experiment; the principles of dynamics, as applied to water and other fluids.

☞ The word is sometimes used as a general term, including both hydrostatics and hydraulics, together with pneumatics and acoustics.