py·re·thrin /paɪˈriθrən, ˈrɛ-/
除蟲菊素
py·re·thrin /paɪˈrɪθrən, ˈrɛθrən/ 名詞
除蟲菊酯
Pyr·eth·rin n. Chem. A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor.
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