hydraulic fluid

American  

noun

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

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Etymology

Origin of hydraulic fluid

First recorded in 1940–45

Example Sentences

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

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

From Los Angeles Times

Instead of regular hydraulic fluid, food-grade vegetable oil fills the hydraulic cylinders powering the “O” lifts — so they don’t contaminate the water in case of a leak.

From Los Angeles Times

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

An FAA environmental assessment of the spacecraft notes that some stages of the rocket used kerosene as fuel, which is toxic to breathe; the assessment also notes over 100 gallons of hydraulic fluid in the rocket, which is often hazardous.

From Salon