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

1950–55; pyrethr(in) + -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrethroid (paɪˈriːθrɔɪd)
1.  any of various chemical compounds having similar insecticidal properties to pyrethrin
2.  of or relating to such compounds

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Bring repellent and a spray containing a pyrethroid insecticide to clear your room of bugs.
Avoid synthetic pyrethroid products, which are not approved for organic gardening.
Key weapons in the fight against malaria, pyrethroid insecticides, are losing their edge.
In their place, pyrethroid insecticides have become popular.
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