Definition of acid rain noun from the Oxford Advanced Learner's Dictionary

 

acid rain

 noun
noun
BrE BrE//ˌæsɪd ˈreɪn//
 
; NAmE NAmE//ˌæsɪd ˈreɪn//
 
[uncountable] Rain, Waste and pollution
 
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rain that contains harmful chemicals from factory gases and that damages trees, crops and buildings Sulphur, falling as acid rain, is killing fish in the Great Lakes. See related entries: Rain, Waste and pollution
See the Oxford Advanced American Dictionary entry: acid rain