查词历史：
- pyrethrum
n.
- 复数： pyrethrums
- 易混淆的单词：Pyrethrum
- Noun
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1. made of dried flower heads of pyrethrum plants
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2. white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
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3. spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum
