Definition of pyrethrin in English:

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Pronunciation: /pīˈrēTHrən/
Pronunciation: /pīˈreTHrən/


Any of a group of insecticidal compounds present in pyrethrum flowers.
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.

For editors and proofreaders

Syllabification: py·re·thrin

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