de·fo·liant 7 [defoliant defoliants] BrE [ˌdiːˈfəʊliənt]  NAm | UPSC SSC Q&A Analysis
de·fo·liant 7 [defoliant defoliants] BrE [ˌdiːˈfəʊliənt]  NAmE [ˌdiːˈfoʊliənt]  noun countable,uncountable
a chemical that removes the leaves from plants, sometimes used as a weapon in war