hydraulic

adj. 1 (of water, oil, etc.) Conveyed through pipes or channels. 2 (of a mechanism etc.) Operated by liquid moving in this way (hydraulic brakes).  hydraulically adv. [greek hudor water, aulos pipe]

a. Of or pertaining to hydraulics, or to fluids in motion; conveying, or acting by, water; as, an hydraulic clock, crane, or dock.