Main Entry: hy·drau·lic

Pronunciation: \hī-ˈdrȯ-lik\

Function: adjective

Etymology: Latin hydraulicus, from Greek hydraulikos, from hydraulis hydraulic organ, from hydr- + aulos reed instrument — more at alveolus

Date: 1661

1 : operated, moved, or effected by means of water
2 a : of or relating to hydraulics <hydraulic engineer> b : of or relating to water or other liquid in motion <hydraulic erosion>
3 : operated by the resistance offered or the pressure transmitted when a quantity of liquid (as water or oil) is forced through a comparatively small orifice or through a tube <hydraulic brakes>
4 : hardening or setting under water <hydraulic cement>

— hy·drau·li·cal·ly \-li-k(ə-)lē\ adverb