Definition of hydraulic in English:


Syllabification: hy·drau·lic
Pronunciation: /hīˈdrôlik


  • 1Denoting, relating to, or operated by a liquid moving in a confined space under pressure: hydraulic fluid hydraulic lifting gear
    More example sentences
    • After we shot down the catapult, we saw a sheen of hydraulic fluid covering the pressure bulkhead in the back of the aircraft.
    • That includes using non-toxic hydraulic oils for his machinery, and synthetic engine oils all around in the hopes of reducing maintenance downtime.
    • Until now, conventional hydraulic oil would break down sooner, leaving your machine's metal abrasively scraping against metal.
  • 2Of or relating to the science of hydraulics.
    More example sentences
    • The eleven imperial water mill visits testify to the founders' keen interest in the science of hydraulic engineering.
    • Mitchell reports that further hydraulic analysis will be conducted within the next two weeks by the Water Resources Hydrology department.
    • Anatomical measurements were done on samples previously used for the analysis of hydraulic parameters.
  • 3(Of cement) hardening under water.
    More example sentences
    • If you see cracks in the walls leaking, some of these can be repaired with hydraulic cement or crack injection.
    • Nevertheless, Henry knew research was expected of him, and he began investigating the chemical reactions involved in the setting of hydraulic cements.



Pronunciation: /-(ə)lē/
More example sentences
  • A hydraulic hammer is basically a hydraulically powered reciprocating piston inside of a body.
  • It's essentially a manual gearbox; the engine's torque is transferred mechanically, rather than hydraulically as in an automatic transmission.
  • The wheels are fitted with dual circuit hydraulically operated disc brakes and anti-skid braking.


early 17th century: via Latin from Greek hudraulikos, from hudro- 'water' + aulos 'pipe'.

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