| 释义 |
pyrethroid Chem.|paɪˈriːθrɔɪd|
[f. as pyrethrin + -oid.]
Any substance possessing the terpenoid structure and insecticidal properties characteristic of the pyrethrins.
1954Analytical Chem. XXVI. 604/1 In recent attempts to estimate small quantities of pyrethrins in flour which had been stored in pyrethrum-treated cotton bags..the extraction..was found to be difficult and there were apparent limitations in the accuracy of the analysis of pyrethroids. 1956Nature 25 Feb. 357/2 It has now also been established that the pyrethroids undergo detoxification in the adult housefly. 1971Ibid. 15 Oct. 441/2 Organochlorine and organophosphorus insecticides, many of which tend to break down less quickly than the pyrethroids. 1977Protecting World's Crops (Shell Internat. Petroleum Co.) 2 Insecticides fall into four main categories: chlorinated hydrocarbons, organo-phosphorus, carbamates and synthetic pyrethroids. |