pyrethrum
1. [ noun ] (botany) 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: Tanacetum_coccineum Chrysanthemum_coccineum painted_daisy
Related terms: flower Tanacetum
2. [ noun ] (botany) 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: Dalmatia_pyrethrum Tanacetum_cinerariifolium Chrysanthemum_cinerariifolium Dalmatian_pyrethrum
Related terms: herb Tanacetum
3. [ noun ] made of dried flower heads of pyrethrum plants
Related terms: insecticide
4. [ noun ] (biology,botany) used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
Synonyms: genus_Pyrethrum
Related terms: asterid_dicot_genus Compositae