What does hydraulic mean?
Hydraulic describes something that works through the movement or pressure of a liquid. In engineering, hydraulic equipment uses a confined fluid, often oil or water, to transmit force and operate machines. Examples include hydraulic brakes, lifts, cranes, excavators, and power-steering systems. The term is also common in figurative business and technological expressions, such as “hydraulic growth” or “hydraulic pricing,” where it conveys an expanding system driven by powerful, cascading forces. Hydraulic is related to hydraulics, the branch of mechanics concerned with using pressurized fluids, and to hydrostatics, the study of fluids at rest. Its name reflects Greek roots meaning “water” and “pipe,” reflecting the long-established practice of using flowing water for transport, power, and control. The word is technical in its literal sense but broadly understood in modern business usage.
adjectiveRelating to or involving the movement, pressure, or transmission of force in a liquid, especially within a system using a confined fluid under pressure. Hydraulic systems commonly use oil or water to operate machinery, brakes, lifts, or other equipment.
- Relating to the movement, pressure, or transmission of force in a liquid.
- Using a liquid under pressure to transmit power or perform work.
"The bridge's hydraulic system uses pressurized fluid to raise its central span."
"The rescue crew used hydraulic tools to lift the damaged vehicle safely."
"Hydraulic brakes provide the braking force needed in heavy construction equipment."
Hydraulic comes from Greek words meaning “water” and “pipe,” so the word literally evokes the ancient engineering art of moving water through channels.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hydraulic come from?
Hydraulic derives from Latin hydraulicus, from Greek hydraulikos, a term associated with hydor, meaning “water,” and aulos, meaning “pipe” or “channel.” The Greek form referred to waterworks and the movement of water through pipes. English adopted the word in the early 17th century for the study and application of water pressure, later expanding to include other pressurized liquids such as oil.
Related word forms
How hydraulic is actually used
This is primarily a technical and engineering term. It is also used figuratively in modern business and technology language, as in “hydraulic market,” where it suggests forces moving through a system with powerful, difficult-to-control pressure.
Easily confused with hydraulic
Hydraulic describes systems in which a fluid moves or transmits force under pressure, while hydrostatic usually refers to fluids at rest or to pressure within a stationary fluid.