Skip to main content
EnglishTHE SCHOLAR'S LEXICON

pyrethrin

/pahy-ree-thrin, -reth-rin/US // paɪˈri θrɪn, -ˈrɛθ rɪn //UK // (paɪˈriːθrɪn) //

除虫菊酯,除虫菊素,除虫菊脂,除虫剂

Definitions

n.名词 noun
  1. 1

    Chemistry.

    • : Also called pyrethrin I. a viscous, water-insoluble liquid, C21H28O3, extracted from pyrethrum flowers, used as an insecticide.
    • : Also called pyrethrin II. a like compound, C22H28O5, obtained and used similarly.

Examples

  • Although each product has the same effect on insects — and presents the same risks to beneficial insects — pyrethrin usually is more potent and lasts longer.

Level 4Browse all words →