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

 

groundwater

 noun
noun
BrE BrE//ˈɡraʊndwɔːtə(r)//
 
; NAmE NAmE//ˈɡraʊndwɔːtər//
 
[uncountable]
 
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water that is found under the ground in soil, rocks, etc.
See the Oxford Advanced American Dictionary entry: groundwater