Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A white or tan powder, C10H5Cl7, formerly used as a pesticide, that is highly toxic to humans and is a suspected carcinogen.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An organochlorine compound formerly used as an insecticide.

Etymologies

hepta- + chlor(ine).
(American Heritage® Dictionary of the English Language, Fourth Edition)

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