Plants and Animals
Plants
Plants
pyrethrum

pyrethrum

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views updated May 29 2018

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.

The Oxford Pocket Dictionary of Current English

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pyrethrum

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views updated May 11 2018

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.

A Dictionary of Biology

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pyrethrum

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

The Concise Oxford Dictionary of English Etymology T. F. HOAD

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