| 释义 |
py·re·thrin AHD[pī-rēʹthrĭn, -rĕthʹrĭn] D.J.[paɪˈriːθrɪn, -ˈreθrɪn]K.K.[paɪˈriθrɪn, -ˈrɛθrɪn]n.（名词）- Either of two viscous liquid esters, C21H 28O 3 or C 22H 28O 5, that are extracted from pyrethrum flowers and used as insecticides. 除虫菊酯：两种液体粘性酯中的任一种，C21H 28O 3或C 22H 28O 5，从红花除虫菊花上提取，用于杀死昆虫
- pyrethr(um) pyrethr(um)
- -in -in
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