pyrethrum
    n 1: made of dried flower heads of pyrethrum plants
    2: 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: pyrethrum,
       Dalmatian pyrethrum, Dalmatia pyrethrum, Tanacetum
       cinerariifolium, Chrysanthemum cinerariifolium]
    3: 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: painted daisy, pyrethrum, Tanacetum
       coccineum, Chrysanthemum coccineum]
    4: used in former classifications for plants later placed in
       genus Chrysanthemum and now often included in genus Tanacetum
       [syn: Pyrethrum, genus Pyrethrum]