pyrethrin

py.re.thrin

n.（名词）
Either of two viscous liquid esters, C2H 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，C2H 28O 3或C 22H 28O 5，从红花除虫菊花上提取，用于杀死昆虫

来源：
pyrethr(um)
pyrethr(um)
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