py·re·thrum /paɪˈriθrəm, ˈrɛ-/
 除蟲菊


 py·re·thrum /paɪˈrɪθrəm, ˈrɛθrəm/ 名詞



 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 [syn: {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 [syn: painted daisy, {Tanacetum
         coccineum, Chrysanthemum coccineum]
      4: used in former classifications for plants later placed in
         genus Chrysanthemum and now often included in genus
         Tanacetum [syn: genus Pyrethrum]