pyrethrum

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pyrethrum •minimum • maximum • optimum •chrysanthemum, helianthemum •cardamom • Pergamum • sesamum •per annum • magnum • damnum •Arnhem, Barnum •envenom, venom •interregnum • Cheltenham • arcanum •duodenum, plenum •platinum • antirrhinum • Bonham •summum bonum • Puttnam •ladanum • molybdenum • laudanum •origanum, polygonum •organum • tympanum •laburnum, sternum •gingham • Gillingham • Birmingham •Cunningham • Walsingham •Nottingham • wampum • carom •Abram • panjandrum • tantrum •angstrom • alarum • candelabrum •plectrum, spectrum •arum, harem, harum-scarum, Sarum •sacrum, simulacrum •maelstrom • cerebrum • pyrethrum •Ingram •sistrum, Tristram •Hiram •grogram, pogrom •nostrum, rostrum •cockalorum, decorum, forum, jorum, Karakoram, Karakorum, Mizoram, pons asinorum, quorum •wolfram • fulcrum • Durham •conundrum • buckram • lustrum •serum, theorem •labarum • marjoram • pittosporum •Rotherham • Bertram

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py·re·thrum / pīˈrē[unvoicedth]rəm; -ˈre[unvoicedth]rəm/ • n. an aromatic plant (genus Tanacetum, formerly Chrysanthemum or Pyrethrum) of the daisy family, typically having feathery foliage and brightly colored flowers. ∎  an insecticide made from the dried flowers of these plants.

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pyrethrum An insecticide (see pesticide) prepared from the flowers of Chrysanthemum cinerariifolium. It penetrates the insect's cuticle and is fast-acting, nontoxic to other animals and to plants, and readily biodegradable.

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pyrethrum pellitory of Spain XVI; feverfew XIX. — L. — Gr. púrethron feverfew.