pyrethrum meaning and definition

PYRETHRUM noun

Definition of pyrethrum (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
   • synonyms: Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum 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
   • synonyms: Chrysanthemum coccineum, painted daisy, Tanacetum coccineum
4. used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
   • synonyms: genus Pyrethrum