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pyrethrin Line breaks: pyr|eth¦rin
Pronunciation: /pʌɪˈriːθrɪn/

Definition of pyrethrin in English:


Any of a group of insecticidal compounds present in pyrethrum flowers: pyrethrins can cause allergic reactions [mass noun]: it contains natural pyrethrin
More example sentences
  • Many of these sprays contain one or more of a group of insecticidal compounds known as pyrethrins.
  • These synthetic chemicals mimic the action of natural pyrethrins derived from chrysanthemum flowers.
  • Citrus-oil products, pyrethrin products, as well as those with pyrethrins and diatomaceous earth, may be effective.


1920s: from pyrethrum + -in1.

Words that rhyme with pyrethrin

brethren • Montenegrin
Definition of pyrethrin in:
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