Definition of pyrethrin in English:


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


  • 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.

More definitions of pyrethrin

Definition of pyrethrin in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space