[ hep-tuh-klawr, -klohr ]
/ ˈhɛp təˌklɔr, -ˌkloʊr /


a highly toxic, light-tan, waxy solid, C10H5Cl7, used as an insecticide: its manufacture and use are restricted in the U.S.

Nearby words

  1. hepped,
  2. hepplewhite,
  3. hepplewhite, george,
  4. hepsiba,
  5. hepta-,
  6. heptachord,
  7. heptad,
  8. heptadecanoic acid,
  9. heptagon,
  10. heptagonal

Origin of heptachlor

First recorded in 1945–50; hepta- + chlor-2

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for heptachlor


[ hĕptə-klôr′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.