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	pyrethrin [ pahy-ree-thrin, -reth-rin ] / paɪˈri θrɪn, -ˈrɛθ rɪn / noun 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. Origin of pyrethrin First recorded in 1830–40; pyrethr(um) + -in² Words nearby pyrethrin Pyrenees, Pyrénées-Atlantiques, Pyrénées-Orientales, pyrenocarp, pyrenoid, pyrethrin, pyrethroid, pyrethrum, pyretic, pyreto-, pyretogenesis Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for pyrethrin pyrethrin / (paɪˈriːθrɪn) / noun Also called: pyrethrin I an oily water-insoluble compound used as an insecticide. Formula: C 21 H 28 O 3 Also called: pyrethrin II a compound of similar chemical structure and action, also found in pyrethrum. Formula: C 22 H 28 O 5 Word Origin for pyrethrin C19: from pyrethrum + -in Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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