[ pʌɪ'ri:θrəm ]
■ noun
1》 an aromatic plant of the daisy family, typically with feathery foliage and brightly coloured flowers. [Genus Tanacetum (formerly Pyrethrum ): several species.]
2》 an insecticide made from the dried flowers of these plants.
Origin
ME (denoting pellitory): from L., from Gk purethron 'feverfew'.