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hydraulic fluid

American  

noun

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


Etymology

Origin of hydraulic fluid

First recorded in 1940–45

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Airbus and Boeing, the two biggest aircraft manufacturers, have acknowledged that malfunctions can lead to oil and hydraulic fluid leaking into the engines or power units and vaporizing at extreme heat.

From The Wall Street Journal • Sep. 14, 2025

The technology uses the bobbing floaters to compress pistons, which push hydraulic fluid into storage tanks located nearby on land.

From Los Angeles Times • Sep. 10, 2025

Investigators said Friday they found hydraulic fluid leaking from a hose in the landing gear system of a FedEx plane that was forced to make an emergency landing this month in Chattanooga, Tennessee.

From Seattle Times • Oct. 20, 2023

René Descartes believed that animal spirits flowed from the brain through hollow nerves and inflated the muscles, just as hydraulic fluid traveled through machines in the royal gardens at Saint-Germain.

From Scientific American • Apr. 9, 2022

This would produce changes in the pressure of the hydraulic fluid by affecting the kinetic energy of the fluid's atoms.

From Tom Swift and The Visitor from Planet X by Appleton, Victor [pseud.]

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