Definition of hydrospeed noun from the Oxford Advanced Learner's Dictionary

 

hydrospeed

 noun
noun
BrE BrE//ˈhaɪdrəʊspiːd//
 
; NAmE NAmE//ˈhaɪdroʊspiːd//
 
(also hydrospeeding)(British English)[uncountable] Extreme sports
 
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the sport of jumping into a river that is flowing fast, wearing equipment that allows you to float See related entries: Extreme sports