- pyrethrum - made of dried flower heads of pyrethrum plants
--1 is a kind of insecticide, insect powder
- 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
--2 is a kind of herb, herbaceous plant
--2 is a member of Tanacetum, genus Tanacetum- 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
--3 is a kind of flower
--3 is a member of Tanacetum, genus Tanacetum- Pyrethrum, genus Pyrethrum - used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
--4 is a kind of asterid dicot genus
--4 is a member ofCompositae, family Compositae, Asteraceae, family Asteraceae, aster family - 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