hydraulic fluid

noun
a fluid, usually of low viscosity, as oil, used in a hydraulic system.

Origin:
1940–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The bending pumps hydraulic fluid through a motor, which generates electricity.
When a vehicle using the technology hits a small bump in the road, hydraulic
  fluid squirts into a turbine.
Ocean waves move the hydraulic fluid, which spins the generator.
Instead, the engine pressurizes the nitrogen tank, which pushes hydraulic fluid
  to drive the wheels.
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