/ pīˈrē[unvoicedth]rəm; -ˈre[unvoicedth]rəm/
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.
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.
pellitory of Spain XVI; feverfew XIX. — L. — Gr. púrethron