英语词汇“pyrethrin”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

　

单词	pyrethrin
释义	WordReference Random House Unabridged Dictionary of American English © 2024 py•re•thrin (pī rē′thrin, -reth′rin),USA pronunciation n. [Chem.] Chemistry, Pest ControlAlso called pyrethrin I. a viscous, water-insoluble liquid, C₂₁H₂₈O₃, extracted from pyrethrum flowers, used as an insecticide. Chemistry, Pest ControlAlso called pyrethrin II. a like compound, C₂₂H₂₈O₅, obtained and used similarly. pyrethr(um) + -in² 1830–40 Collins Concise English Dictionary © HarperCollins Publishers:: pyrethrin /paɪˈriːθrɪn/ n Also called: pyrethrin I an oily water-insoluble compound used as an insecticide. Formula: C₂₁H₂₈O₃ Etymology: 19th Century: from pyrethrum + -in
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更新时间：2025/2/23 11:19:00