pyrethroid

[ 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.

Origin of pyrethroid

First recorded in 1950–55; pyrethr(in) + -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for pyrethroid

pyrethroid

/ (paɪˈriːθrɔɪd) /

noun

any of various chemical compounds having similar insecticidal properties to pyrethrin

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