hydraulic ram(n = noun.artifact) hydraulic pump - 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;
is a kind of pump

aries the ram, battering ram, hydraulic, hydraulic brake, hydraulic brake cylinder, hydraulic brakes, hydraulic cement, hydraulic engineering, hydraulic press, hydraulic pump, hydraulic system, hydraulic transmission, hydraulic transmission system, ram, ram disk, ram down, ram home, ram in, water ram