WordNet (r) 3.0 (2006):

Tanacetum cinerariifolium
    n 1: 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]