pyrethrin / paɪˈri θrɪn, -ˈrɛθ rɪn /

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pyrethrin 的定义

n. 名词 noun

Chemistry.

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

更多pyrethrin例句

  1. 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.