1) Biological pest control
Found on
https://www.crosswordclues.com/clue/pyrethrin
The pyrethrins are a pair of natural organic compounds normally derived from Chrysanthemum cinerariifolium that have potent insecticidal activity. Pyrethrins are neurotoxins that attack the nervous systems of all insects. When present in amounts not fatal to insects, they still appear to have an insect repellent effect. Pyrethrins are gradually re...
Found on
http://en.wikipedia.org/wiki/Pyrethrin
• (n.) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor.
Found on
http://thinkexist.com/dictionary/meaning/pyrethrin/
(from the article `poison`) In general, insecticides derived from plants are low in toxicity. Pyrethrins are widely used insecticides in the home. They have a rapid `knockdown` ... ...florists` chrysanthemum (C. morifolium); feverfew (C. parthenium); corn marigold (C. segetum); and tansy (C. vulgare) are popular garden plants....
Found on
http://www.britannica.com/eb/a-z/p/137
Allergic. Neurotoxic. Found in head-lice treatments, house and garden pesticides, and flea-control products.
Found on
http://www.chemicalglossary.net/definition/1398-Pyrethrin
Pyr'eth·rin noun [ New Latin
Pyrethrum , generic name of feverfew, Greek ... feverfew.]
(Chemistry) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also
Pyrethrum camphor .
Found on
http://www.encyclo.co.uk/webster/P/203
Also calleda viscous, water-insoluble liquid, CHO, extracted from pyrethrum flowers, used as an insecticide. · Also calleda like compound, CHO, obtained and used similarly.
Found on
https://www.infoplease.com/dictionary/pyrethrin
No exact match found.
