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pyrethroid

[pahy-ree-throid, -reth-roid]
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noun Chemistry.
  1. 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. 2018
British Dictionary definitions for pyrethroid

pyrethroid

noun
  1. any of various chemical compounds having similar insecticidal properties to pyrethrin
adjective
  1. 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