pyrethrum

Noun pyrethrum has 4 senses

• pyrethrum(n = noun.plant) - made of dried flower heads of pyrethrum plants;
is a kind of insect powder, insecticide

• pyrethrum(n = noun.plant) chrysanthemum cinerariifolium, dalmatia pyrethrum, dalmatian pyrethrum, tanacetum 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;
is a member of genus tanacetum, tanacetum
is a kind of herb, herbaceous plant

• pyrethrum(n = noun.plant) chrysanthemum coccineum, painted daisy, tanacetum 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;
is a kind of flower
is a member of genus tanacetum, tanacetum

• pyrethrum(n = noun.plant) genus pyrethrum - used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum;
is a kind of asterid dicot genus
is a member of aster family, asteraceae, compositae, family asteraceae, family compositae