[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.

Origin of hydraulics

First recorded in 1665–75; see origin at hydraulic, -ics
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for hydraulics



(functioning as singular) another name for fluid mechanics
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for hydraulics

1670s, from hydraulic; also see -ics.

Online Etymology Dictionary, © 2010 Douglas Harper

hydraulics in Science



The scientific study of water and other liquids, in particular their behavior under the influence of mechanical forces and their related uses in engineering.
A mechanical device or system using hydraulic components.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.