Hydraulic ram Meaning, Definition & Usage

  1. noun a water pump that uses the kinetic energy of flowing water to force a small fraction of that water to a reservoir at a higher level
    hydraulic pump.

WordNet

Definitions
  1. 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.

Webster 1913