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Definition of ozone hole noun from the Oxford Advanced Learner's Dictionary

ozone hole

noun
 
/ˈəʊzəʊn həʊl/
 
/ˈəʊzəʊn həʊl/
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  1. an area in the ozone layer where the amount of ozone has been very much reduced so that harmful radiation from the sun can pass through itTopics The environmentc2, Spacec2
See ozone hole in the Oxford Advanced American Dictionary
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