| pyrethrum | (n) made of dried flower heads of pyrethrum plants |
| pyrethrum | (n) white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum, Syn. Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum cinerariifolium |
| pyrethrum | (n) used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum, Syn. genus Pyrethrum |
| painted daisy | (n) 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, Syn. Chrysanthemum coccineum, Tanacetum coccineum, pyrethrum |
| pellitory | (n) a small Mediterranean plant containing a volatile oil once used to relieve toothache, Syn. pellitory-of-Spain, Anacyclus pyrethrum |