PYRETHRUM • DICTIONARY ONE.COM • Definition of Pyrethrum

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Pyrethrum

noun

Made of dried flower heads of pyrethrum plants.

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.

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, painted daisy, Tanacetum coccineum.

Used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum. Synonym: genus Pyrethrum.

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Etymology of 'Pyrethrum'

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"Pyrethrum" Quotes from Famous Books

... there are many flies, burn pyrethrum powder (Persian insect powder). This stupefies the flies and in this condition they may ...

— The Eugenic Marriage, Volume IV. (of IV.) - A Personal Guide to the New Science of Better Living and Better Babies • Grant Hague

... in the March number of the Naturalist, the editor of this department has sent out the seed of two species of pyrethrum, viz. P. roseum and P. cinerarioefolium, to a large number of correspondents in different parts of North America. Every mail brings us some inquiries for further particulars and directions to guide in the cultivation of the plant and ...

— Scientific American Suppl. No. 299 • Various