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| py·re·thrum [ pī rthrəm, pī réthrəm ] (plural py·re·thrums) |
noun |
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1. type of chrysanthemum: a chrysanthemum cultivated for its ornamental flowers. Genus Chrysanthemum.
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2. insecticide in powder form: a mixture of pyrethrins. Use: insecticide.
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| [Mid-16th century. Via Latin< Greek purethron "feverfew"] |
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