noun
defoliant
A chemical agent used to cause leaves to fall off plants, often in military or agricultural contexts.
ベトナム戦争では枯葉剤が広く使用された。
Defoliants were widely used during the Vietnam War.
Compound of 枯葉 (かれは, 'withered leaves') + 剤 (ざい, 'agent, chemical').