defoliantn. 脫葉劑、落葉劑學術名詞落葉劑：生態學、化學術語、食品科技、土木工程、植物學脫葉劑：肥料學、機械工程、植物學除藥劑：獸醫學英文釋義a chemical that is sprayed on plants and causes their leaves to fall off