pyrethrum Meaning, Definition & Usage

1. noun made of dried flower heads of pyrethrum plants
   
2. noun white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
   Dalmatia pyrethrum; Tanacetum cinerariifolium; Dalmatian pyrethrum; Chrysanthemum cinerariifolium.
   
3. noun 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
   painted daisy; Chrysanthemum coccineum; Tanacetum coccineum.
   
4. noun used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
   genus Pyrethrum.
   

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