Definition of pyrethrin in English:


Syllabification: py·re·thrin
Pronunciation: /pīˈrēTHrən, -ˈreTHrən


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

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