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plural pyrethrins
(organic chemistry) Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring. quotations examples
The biggest risk raised in the findings, Mr. Abecassis said, is the exposure to pesticides, which have been linked to a range of serious illnesses including fatal cancers and organ damage. Six of the tested products contained chemicals like myclobutanil and pyrethrins in concentrations far above state limits, according to the analysis.
2022 December 1, Ashley Southall, “What’s in New York’s Illicit Cannabis: Germs, Toxins and Metals”, in The New York Times