pyrethrums

1. made of dried flower heads of pyrethrum plantsSynonyms: pyrethrum

2. white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus ChrysanthemumSynonyms: Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum cinerariifolium, pyrethrum

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 ChrysanthemumSynonyms: Chrysanthemum coccineum, Tanacetum coccineum, painted daisy, pyrethrum

4. used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus TanacetumSynonyms: Pyrethrum, genus Pyrethrum