hydraulic ram

noun
a device by which the energy of descending water is utilized to raise a part of the water to a height greater than that of the source.

Origin:
1800–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hydraulic ram
 
n
1.  any large device involving the displacement of a piston or plunger driven by fluid pressure
2.  a form of water pump utilizing the kinetic energy of running water to provide static pressure to raise water to a reservoir higher than the source

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Once formed, the bale is then pushed out of the baling machine by a second
  hydraulic ram.
The compactor shall be water tight and contain hydraulic ram internally.
Once formed, the bale is then pushed out of the baling machine by a hydraulic
  ram.
Hydraulic ram dimensions and stroke need to be accounted for when locating
  tendon anchors within the box.
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