from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, involving, moved by, or operated by a fluid, especially water, under pressure.
  • adj. Able to set and harden under water, as Portland cement.
  • adj. Of or relating to hydraulics.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Pertaining to water
  • adj. Related to hydraulics

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to hydraulics, or to fluids in motion; conveying, or acting by, water.

from The Century Dictionary and Cyclopedia

  • Pertaining or relating to fluids in motion, or to hydraulics. See hydraulics.
  • The larger or lifting piston of a hydraulic press.
  • In mining, to work by the hydraulic-mining process.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. moved or operated or effected by liquid (water or oil)
  • adj. of or relating to the study of hydraulics


from The American Heritage® Dictionary of the English Language, 4th Edition

Latin hydraulicus, from Greek hudraulikos, from hudraulis, water organ : hudro-, hudr-, hydro- + aulos, pipe, flute.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ὑδραυλικός ("of a water organ"), from ὕδραυλις ("water organ").


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  • This indicated that the main hydraulic system had been cut, and there was no pressure to actuate the doors: thus when the bombs-away signal was given, the bombs (eight 1,000 pounders) were dropped through the closed doors.


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