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.