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
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.
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