Webster's English Dictionary

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hydraulic

hy.drau.lic \hi--'dro.-lik\ \-li-k(*-)le-\ aj [L hydraulicus, fr. Gk 
   hydraulikos, fr. hydraulis hydraulic o]rgan, fr. hydr- + aulos reed 
   instrument - more at ALVEOLUS 1: operated, moved, or effected by means of 
   water  2a: of or relating to hydraulics {~ engineer}  2b: of or relating to 
   water or other liquid in motion {~ erosion> 3: operated by the resistance 
   offered or the pressure when a quantity of w ater, oil, or other liquid is 
   forced through a comparatively small orifice or through a tube 4: hardening 
   or setting under water {~ cement}  - hy.drau.li.cal.ly av