Definition of rainwater noun from the Oxford Advanced American Dictionary

 

rainwater

 noun
noun
NAmE//ˈreɪnˌwɔt̮ər//
 
, NAmE//ˈreɪnˌwɑt̮ər//
 
[uncountable]
 
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water that has fallen as rain a barrel for collecting rainwater
See the Oxford Advanced Learner's Dictionary entry: rainwater