a chemical that is sprayed on plants and causes their leaves to fall off
例句
Defoliant:Chemical dust or spray applied to plants to cause their leaves to drop off prematurely. 落叶剂:落叶剂是一种化学粉剂或喷洒剂，施于植物以使树叶提早掉落。
The crash had spilled a noxious defoliant into the planet's ecology, ravaging the native flora. 这次坠毁将一种有害的落叶剂洒入星球的生态系统中，破坏着当地的植物群。
Vietnamese victims of Agent Orange, a poisonous defoliant used by America in the war, are still seeking compensation. 落叶剂（美军在越战中使用的一种落叶毒素）的越南受害者仍在要求获得赔偿。
Defoliant : Chemical dust or spray applied to plants to cause their leaves to drop off prematurely. 落叶剂:落叶剂是一种化学粉剂或喷洒剂,施于植物以使树叶提早掉落。
Litigation about Agent Orange, a defoliant and herbicide used by American forces in the Vietnam war, has provided the most extensive judicial discussion of toxic causation. 关于药剂橙（一种美国部队在越南战争中使用的落叶剂和除劳剂）的立法，已经提供了最广泛的有毒物质因果关系的司法讨论。
