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

 

rainwater

 noun
noun
BrE BrE//ˈreɪnwɔːtə(r)//
 
; NAmE NAmE//ˈreɪnwɔːtər//
 
, also NAmE//ˈreɪnwɑːtər//
 
[uncountable] Rain
 
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water that has fallen as rain a barrel for collecting rainwater She saw her reflection in a pool of rainwater beside her. See related entries: Rain
See the Oxford Advanced American Dictionary entry: rainwater