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

 

defoliation

 noun
noun
BrE BrE//ˌdiːˌfəʊliˈeɪʃn//
 
; NAmE NAmE//ˌdiːˌfoʊliˈeɪʃn//
 
[uncountable](specialist)
 
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the act of destroying the leaves of trees or plants, especially with chemicals