Pyrethrum meaning

pī-rē'thrəm, -rĕth'rəm
An insecticide made from the dried flower heads of any of these plants.
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A perennial plant (Chrysanthemum coccineum) of the composite family, widely grown for the white, pink, red, or purple flower heads.
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An insecticide made from the dried flower heads of several Old World chrysanthemums, esp. a species (Chrysanthemum cinerariaefolium) now grown extensively in the U.S.
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Any of several perennial African plants of the genus Tanacetum, especially Tanecetum cinerariifolium.
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(organic chemistry) Any of several insecticides obtained from these plants; pyrethrin.
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Origin of pyrethrum

  • Latin pellitory (Anacyclus pyrethrum) from Greek purethron from pūr fire (from its warming effect) pyretic
    From American Heritage Dictionary of the English Language, 5th Edition