[hahy-draw-liks, -drol-iks]
noun (used with a singular verb)
the science that deals with the laws governing water or other liquids in motion and their applications in engineering; practical or applied hydrodynamics.

1665–75; see hydraulic, -ics

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hydraulics (haɪˈdrɒlɪks)
(functioning as singular) another name for fluid mechanics

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
hydraulics   (hī-drô'lĭks)  Pronunciation Key 
  1. The scientific study of water and other liquids, in particular their behavior under the influence of mechanical forces and their related uses in engineering.

  2. A mechanical device or system using hydraulic components.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
So does even a basic understanding of physics and hydraulics.
My way requires a lot of electricity, and possibly hydraulics.
Nearly every power feature was driven by hydraulics, including the seats,
  windows and sunroof.
After a few moments the hydraulics have brought the car to it's ride height.
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