pyrethrum definition

  • noun:
    • some of a number of old-world plants regarding the genus Chrysanthemum, particularly C. coccineum, cultivated for their showy flower heads.
    • An insecticide produced from the dried flower heads of Chrysanthemum cinerariifolium or C. coccineum.
    • any one of several perennial African flowers associated with the genus Chrysanthemum, particularly Chrysanthemum cinerariaefolium
    • some of a number of pesticides gotten because of these plants; pyrethrin
    • A plant of the genus Pyrethrum; feverfew.
    • [capitalized] A former genus of composite flowers of this tribe Anthemide√¶, now included within the section Pyrethra within the genus Chrysanthemum, from where it was distinguished by achenes almost equally from five- to ten-ribbed and crowned with a pappus, figures now known to vary in the same types.
    • A powdered preparation of pyrethrum, made use of as an insectifuge. Also referred to as pyrethrum-powder. See insect-powder and buhach.
    • In pharmacy, the Anacyclus Pyrethrum, or pellitory-of-Spain.
    • made from dried rose minds of pyrethrum plants
    • white-flowered pyrethrum of Balkan location whoever pinnate leaves are white and silky-hairy below; source of an insecticide; occasionally put in genus Chrysanthemum
    • found in former classifications for flowers later put in genus Chrysanthemum and now usually incorporated into genus Tanacetum
    • spring-flowering garden perennial of Asiatic source having carefully divided aromatic leaves and white to pink-purple blossoms; source of an insecticide; sometimes placed in genus Chrysanthemum

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