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

acid rain

noun
 
/ˌæsɪd ˈreɪn/
 
/ˌæsɪd ˈreɪn/
[uncountable]
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  1. 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.
    Topics The environmentc1, Weatherc1
See acid rain in the Oxford Advanced American Dictionary
trait
noun
 
 
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