Definition of hydraulic
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>
hydraulicallyplay \-li-k(ə-)lē\ adverb
Did You Know?
By means of a hydraulic lift, the driver can lift the bed of a dump truck with the touch of a button. He might also repair the hydraulic steering, the hydraulic brake, or the hydraulic clutch—all of which, like the lift that holds everything up, take advantage of the way liquids act under pressure. Somewhat like a pulley or a lever, a hydraulic system magnifies the effect of moderate pressure exerted over a longer distance into powerful energy for a shorter distance.
Origin and Etymology of hydraulic
Latin hydraulicus, from Greek hydraulikos, from hydraulis hydraulic organ, from hydr- + aulos reed instrument — more at alveolus
First Known Use: 1661
HYDRAULIC Defined for English Language Learners
Definition of hydraulic for English Language Learners
: operated by the pressure of a fluid
: occurring or used in a hydraulic system
HYDRAULIC Defined for Kids
Definition of hydraulic for Students
1 : operated, moved, or brought about by means of water <hydraulic pressure>
2 : operated by liquid forced through a small hole or through a tube <hydraulic brakes>
Seen and Heard
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