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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.

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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

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

Internal documents from airlines and aircraft manufacturers provide detailed instructions for identifying oil and hydraulic fluid contamination in the air supply by smells like “dirty socks,” “musty” and “acrid,” The Times found.

From Los Angeles Times Mar. 31, 2022

Philadelphia put Crisco and hydraulic fluid on downtown light poles to discourage Eagles revelers from trying to climb them.

From Seattle Times Feb. 9, 2018

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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