单词 | pyrethrum |
释义 | Word Frequency pyrethrum(paɪˈriːθrəm) noun 1. any of several cultivated Eurasian chrysanthemums, such as Chrysanthemum coccineum and C. roseum, with white, pink, red, or purple flowers 2. any insecticide prepared from the dried flowers of any of these plants, esp C. roseum Word origin C16: via Latin from Greek purethron feverfew, probably from puretos fever; see pyretic |
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