Heptachlor Definition
hĕptə-klôr
noun
A waxy solid, C10H7Cl7, similar to chlordane, formerly used as an insecticide.
Webster's New World
An organochlorine compound formerly used as an insecticide.
Wiktionary
Origin of Heptachlor
hepta– chlor(ine)
From American Heritage Dictionary of the English Language, 5th Edition
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