hydraulic press

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A machine in which a large force is exerted on the larger of two pistons in a pair of hydraulically coupled cylinders by means of a relatively small force applied to the smaller piston.

GNU Webster's 1913

1. adj. a hydrostatic press. See under Hydrostatic.

WordNet 3.0

1. n. press in which a force applied by a piston to a small area is transmitted through water to another piston having a large area