1. (noun)pyrethrum made of dried flower heads of pyrethrum plants
2. (noun)pyrethrum, Dalmatian pyrethrum, Dalmatia pyrethrum, Tanacetum cinerariifolium, Chrysanthemum cinerariifolium white-flowered pyrethrum of Balkanarea whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genusChrysanthemum
3. (noun)painted daisy, pyrethrum, Tanacetum coccineum, Chrysanthemum coccineum spring-flowering gardenperennial of Asiaticorigin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genusChrysanthemum
4. (noun)Pyrethrum, genus Pyrethrum used in former classifications for plants later placed in genusChrysanthemum and now often included in genusTanacetum
Definition of 'pyrethrum'
