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defoliant

noun [C or U]
 
 
/ˌdiːˈfəʊ.li.ənt/ US  /-ˈfoʊ-/

Definition

a chemical that is used to make the leaves drop off plantsEnvironmental issuesRubbish and wasteProtection and protectors
(Definition of defoliant noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of defoliant