Longman Dictionary of Contemporary English homepage

hydraulics

 noun
     
Related topics: Engineering
hy‧draul‧ics
1 [plural] parts of a machine or system that use the pressure of water or other liquids to move or lift things
2 [uncountable]TE the study of how to use the pressure of water or other liquids to produce power
Definition from the Longman Dictionary of Contemporary English
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