hydraulic press

WordReference Random House Unabridged Dictionary of American English © 2025

hydrau′lic press′, 

1. Hydraulics a machine permitting a small force applied to a small piston to produce, through fluid pressure, a large force on a large piston.

• 1850–55

Collins Concise English Dictionary © HarperCollins Publishers::

hydraulic press noun

1. a press that utilizes liquid pressure to enable a small force applied to a small piston to produce a large force on a larger piston. The small piston moves through a proportionately greater distance than the larger