- a light tan, crystalline, water-insoluble, poisonous solid, C12H8OCl6, used as an insecticide: manufacture and use have been discontinued in the U.S.
- a crystalline insoluble substance, consisting of a chlorinated derivative of naphthalene: a contact insecticide the use of which is now restricted as it accumulates in the tissues of animals. Formula: C 12 H 8 OCl 6
