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pyrethroid

American

[pahy-ree-throid, -reth-roid] / paɪˈri θrɔɪd, -ˈrɛθ rɔɪd /

noun

Chemistry.

any of several synthetic compounds that are similar to but more persistent than natural pyrethrins.

pyrethroid British

/ paɪˈriːθrɔɪd /

noun

any of various chemical compounds having similar insecticidal properties to pyrethrin

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adjective

of or relating to such compounds

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of pyrethroid

First recorded in 1950–55; pyrethr(in) + -oid

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Testing also revealed the pyrethroid insecticides cypermethrin and bifenthrin.

From Salon • Mar. 20, 2024

That prompted WHO on 14 March to strongly recommend their use in regions where pyrethroid resistance has spread.

From Science Magazine • Mar. 22, 2023

Kasai noted that the mosquitoes with this mutation are unlikely to thrive in areas that do not use pyrethroid insecticides.

From Washington Post • Dec. 21, 2022

"Unfortunately in Puerto Rico, many of the pyrethroid insecticides met with a high degree of resistance," Frieden said.

From US News • May 9, 2016

Many farmers are also increasing their use of pyrethroid pesticides, spraying crops up to five times a year rather than just the normal one or two.

From Nature • May 19, 2015

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023