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

 

hydrosphere

 noun
noun
BrE BrE//ˈhaɪdrəʊsfɪə(r)//
 
; NAmE NAmE//ˈhaɪdroʊsfɪr//
 
[usually singular](specialist)
 
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all of the water on or over the earth’s surface
See the Oxford Advanced American Dictionary entry: hydrosphere