Definition of hydraulically adverb from the Oxford Advanced Learner's Dictionary

 

hydraulically

 adverb
adverb
BrE BrE//haɪˈdrɔːlɪkli//
 
, BrE//haɪˈdrɒlɪkli//
 
; NAmE NAmE//haɪˈdrɔːlɪkli//
 
 
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in a way that relies on liquid moving through pipes under pressure hydraulically operated doors