pyrethrum
has definitions from the fields of biology,botany
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[ noun ] (botany) 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
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[ noun ] (botany) 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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[ noun ] made of dried flower heads of pyrethrum plants
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[ noun ] (biology,botany) used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
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