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 of hydraulic ram
First recorded in 1800–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
any large device involving the displacement of a piston or plunger driven by fluid pressure
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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012