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pyrethrum

Definitions of pyrethrum
  1. 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
    synonyms: Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum cinerariifolium
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    type of:
    herb, herbaceous plant
    a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
  2. 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
    synonyms: Chrysanthemum coccineum, Tanacetum coccineum, painted daisy
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    type of:
    flower
    a plant cultivated for its blooms or blossoms
  3. noun
    made of dried flower heads of pyrethrum plants
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    type of:
    insect powder, insecticide
    a chemical used to kill insects
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