1. (

• pyrethrum ,

) made of dried flower heads of pyrethrum plants ;

2. (

• pyrethrum ,
• Dalmatian_pyrethrum ,
• Dalmatia_pyrethrum ,
• Tanacetum_cinerariifolium ,
• Chrysanthemum_cinerariifolium

) 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. (

• painted_daisy ,
• pyrethrum ,
• Tanacetum_coccineum ,
• Chrysanthemum_coccineum

) 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 ;

4. (

• Pyrethrum ,
• genus_Pyrethrum

) used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum ;