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pyrethrum n. 除蟲菊 除蟲菊 pyrethrum
n 1: made of dried flower heads of pyrethrum plants 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 [synonym: {pyrethrum}, {Dalmatian pyrethrum}, {Dalmatia pyrethrum}, {Tanacetum cinerariifolium}, {Chrysanthemum cinerariifolium}] 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 [synonym: {painted daisy}, {pyrethrum}, {Tanacetum coccineum}, {Chrysanthemum coccineum}] 4: used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum [synonym: {Pyrethrum}, {genus Pyrethrum}]
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