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pyrethrin Syllabification: py·re·thrin
Pronunciation: /pīˈrēTHrən/
/pīˈreTHrən/

Definition of pyrethrin in English:

noun

Chemistry
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.

Origin

1920s: from pyrethrum + -in1.

Definition of pyrethrin in:
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