[hep-tuh-klawr, -klohr]
a highly toxic, light-tan, waxy solid, C 10 H 5 Cl 7 , used as an insecticide: its manufacture and use are restricted in the U.S.

1945–50; hepta- + chlor-2

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Science Dictionary
heptachlor   (hěp'tə-klôr')  Pronunciation Key 
A white or tan powder used as a pesticide. Because it is highly toxic to humans and is a suspected carcinogen, its use has been largely discontinued. Chemical formula: C10H5Cl7.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Pathology report on mice fed aldrin, dieldrin, heptachlor or heptachlor epoxide for two years.
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