A colorless odorless water-insoluble crystalline insecticide C₁₄H₉Cl₅ that tends to accumulate in ecosystems and has toxic effects on many vertebrates and has been banned in many countries since 1974; abbr DDT.

学名：二氯二苯三氯乙烷；俗名：滴滴涕；DDT。一种杀虫剂；分子式为 C₁₄H₉Cl₅，因会污染环境，及累积于动物体中造成死亡，自一九七四年以来多个国家已禁止使用。