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| 单词 | pyrethrin ii |
| 释义 | pyrethrin II in British English (paɪˈriːθrɪn tuː) noun another name for pyrethrin (sense 2) pyrethrin in British English (paɪˈriːθrɪn) noun 1. Also called: pyrethrin I an oily water-insoluble compound used as an insecticide. Formula: C21H28O3 2. Also called: pyrethrin II a compound of similar chemical structure and action, also found in pyrethrum. Formula: C22H28O5 Word origin C19: from pyrethrum + -in |
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