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]