defoliant

详细解释:n. 脱叶剂, 落叶剂
【化】 脱叶剂

英语解释：

名词 defoliant:

a chemical that is sprayed on plants and causes their leaves to fall off

详细解释：

de.fo.li.ant

n.（名词）
A chemical sprayed or dusted on plants to cause the leaves to fall off.
落叶剂：一种化学药剂，喷洒在植物上可使叶脱落