柯林斯詞典defoliant /di??f??l??nt/ (defoliants) 1. N-MASS A defoliant is a chemical used on trees and plants to make all their leaves fall off. Defoliants are especially used in war to remove protection from an enemy. 脫葉劑 返回 defoliant劍橋詞典a chemical that is used to make the leaves drop off plants 落葉劑,枯葉劑 返回 defoliant