查词历史：

Pyrethrum Pyramid Pylon

Pyrethrum
生词本

Noun

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

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