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2 definitions found
 for hydraulic
From The Collaborative International Dictionary of English v.0.48 :

  Hydraulic \Hy*drau"lic\, a. [F. hydraulique, L. hydraulicus, fr.
     Gr. ?, ?, a water organ; "y`dwr water + ? flute, pipe. See
     Hydra.]
     Of or pertaining to hydraulics, or to fluids in motion;
     conveying, or acting by, water; as, an hydraulic clock,
     crane, or dock.
     [1913 Webster]
  
     Hydraulic accumulator, an accumulator for hydraulic
        machinery of any kind. See Accumulator, 2.
  
     Hydraulic brake, a cataract. See Cataract, 3.
  
     Hydraulic cement, a cement or mortar made of hydraulic
        lime, which will harden under water.
  
     Hydraulic elevator, a lift operated by the weight or
        pressure of water.
  
     Hydraulic jack. See under Jack.
  
     Hydraulic lime, quicklime obtained from hydraulic
        limestone, and used for cementing under water, etc.
  
     Hydraulic limestone, a limestone which contains some clay,
        and which yields a quicklime that will set, or form a
        firm, strong mass, under water.
  
     Hydraulic main (Gas Works), a horizontal pipe containing
        water at the bottom into which the ends of the pipes from
        the retorts dip, for passing the gas through water in
        order to remove ammonia.
  
     Hydraulic mining, a system of mining in which the force of
        a jet of water is used to wash down a bank of gold-bearing
        gravel or earth. [Pacific Coast]
  
     Hydraulic press, a hydrostatic press. See under
        Hydrostatic.
  
     Hydraulic propeller, a device for propelling ships by means
        of a stream of water ejected under water rearward from the
        ship.
  
     Hydraulic ram, a machine for raising water by means of the
        energy of the moving water of which a portion is to be
        raised. When the rush of water through the main pipe d
        shuts the valve at a, the momentum of the current thus
        suddenly checked forces part of it into the air chamber b,
        and up the pipe c, its return being prevented by a valve
        at the entrance to the air chamber, while the dropping of
        the valve a by its own weight allows another rush through
        the main pipe, and so on alternately.
  
     Hydraulic valve. (Mach.)
     (a) A valve for regulating the distribution of water in the
         cylinders of hydraulic elevators, cranes, etc.
     (b) (Gas Works) An inverted cup with a partition dipping into
         water, for opening or closing communication between two
         gas mains, the open ends of which protrude about the
         water.
         [1913 Webster]

From WordNet (r) 3.0 (2006) :

  hydraulic
      adj 1: moved or operated or effected by liquid (water or oil);
             "hydraulic erosion"; "hydraulic brakes"
      2: of or relating to the study of hydraulics; "hydraulic
         engineer"

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