pyrethroidn.
/pʌɪˈriːθrɔɪd/, U.S. /paɪˈriˌθrɔɪd/ Chemistry.
Any compound possessing the terpenoid structure and insecticidal properties characteristic of the pyrethrins. Frequently attributive.
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pyrethroid1952
1952 Jrnl. Org. Chem. 17 383 An addition is made to the information on the relationship of the toxicity of type I to type II in the pyrethroids.
1977 Protecting World's Crops (Shell Internat. Petroleum Co.) 2 Insecticides fall into four main categories: chlorinated hydrocarbons, organo-phosphorus, carbamates and synthetic pyrethroids.
1988 J. Elkington & J. Hailes Green Consumer Guide (1989) 61 The situation is now improving since the introduction of the synthetic pyrethroid insecticides, such as permethrin and cypermethrin, which are much less toxic to mammals than Lindane.
2005 Daily Tel. 18 July 10/2 Synthetic pyrethroid dips, principally Cypermethrin, have now largely replaced organophosphate dips..in the treatment of sheep pests such as scab, blowfly, ticks and lice.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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n.1952