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New American Oxford Dictionary

heptachlor

hep ta chlor |ˈheptəˌklôr ˈhɛptəklɔr | ▶noun a chlorinated hydrocarbon used as an insecticide. [Chem. formula: C 10 H 5 Cl 7. ]

 

Oxford Dictionary

heptachlor

heptachlor |ˈhɛptəklɔː | ▶noun [ mass noun ] a chlorinated hydrocarbon used as an insecticide. ●Chem. formula: C 10 H 5 Cl 7.