fluid coupling

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noun

Machinery. an apparatus in which a fluid, usually oil, transmits torque from one shaft to another, producing an equal torque in the other shaft.

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Also called hydraulic coupling.

Origin of fluid coupling

First recorded in 1935–40

So we know that boring down to the bedrock and pumping it full of fluid can cause earthquakes.
26 Earthquakes Later, Fracking’s Smoking Gun Is in Texas|James Joiner|January 7, 2015|DAILY BEAST
In Voodoo, the demarcation between life and death is more fluid; helping Voodoo followers create order out of disorder.
‘Gods of Suburbia’: Dina Goldstein’s Arresting Photo Series on Religion vs. Consumerism|Dina Goldstein|November 8, 2014|DAILY BEAST
In other words, the omnipresent postcolonial Arab State has just about dropped dead, the times are fluid and the vacuums are many.
ISIS and BS|Amal Ghandour|October 15, 2014|DAILY BEAST
She is equally desirous of Levine, as animalistic and eager to consume him while sticky with sanguine fluid.
Sex, Blood and Maroon 5: Pop Culture’s Wounds Run Deep|Lizzie Crocker|October 3, 2014|DAILY BEAST

There are two economies, above ground and underground, and the boundaries at times seem fluid.
A Texas Democrat Tries to Fix the Border|Ruben Navarrette Jr.|August 19, 2014|DAILY BEAST
It separates into three layers upon standing—a brown deposit, a clear fluid, and a frothy layer.
A Manual of Clinical Diagnosis|James Campbell Todd
One frequently wishes to ascertain the specific gravity of quantities of fluid too small to float an urinometer.
A Manual of Clinical Diagnosis|James Campbell Todd
This fluid is then heated, adding crystals of sodium acetate until it becomes perfectly clear.
A Manual of Clinical Diagnosis|James Campbell Todd
The clear, straw-colored fluid which is left after separation of the coagulum is called blood-serum.
A Manual of Clinical Diagnosis|James Campbell Todd
Leukocytes are easily distinguished from red cells, especially when Toisson's diluting fluid is used.
A Manual of Clinical Diagnosis|James Campbell Todd