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

 

defoliant

 noun
noun
BrE BrE//ˌdiːˈfəʊliənt//
 
; NAmE NAmE//ˌdiːˈfoʊliənt//
 
[countable, uncountable]
 
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a chemical that removes the leaves from plants, sometimes used as a weapon in war
See the Oxford Advanced American Dictionary entry: defoliant