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pyrethroid

[pahy-ree-throid, -reth-roid]
noun Chemistry.
  1. any of several synthetic compounds that are similar to but more persistent than natural pyrethrins.
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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
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adjective
  1. of or relating to such compounds
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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