noun
hydraulics
Technical term for the study of the mechanical properties of liquids, especially water, in engineering contexts.
水理学は土木工学の基礎分野の一つです。
Hydraulics is one of the fundamental fields of civil engineering.
Compound of 水 (water) + 理 (principle) + 学 (study). The term is a direct calque from Western scientific terminology, likely coined in the Meiji period.