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

hydrosphere

noun
 
/ˈhaɪdrəʊsfɪə(r)/
 
/ˈhaɪdrəʊsfɪr/
[usually singular] (specialist)
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  1. all of the water on or over the earth’s surface
See hydrosphere in the Oxford Advanced American Dictionary
buttercup
noun
 
 
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