noun plural but singular in construction Date: 1671 a branch of science that deals with practical applications (as the transmission of energy or the effects of flow) of liquid (as water) in motion
HYDRAULICS
Meaning of HYDRAULICS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012