Useful english dictionary. 2012.
pyrethrum — /puy ree threuhm, reth reuhm/, n. 1. any of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers, cultivated as an ornamental. 2. any of several chrysanthemums, as C.… … Universalium
Pyrethrum — refers to several Old World plants of the genus Chrysanthemum (e.g., C. coccineum ) which are cultivated as ornamentals for their showy flower heads. It is also the name of a natural insecticide made from the dried flower heads of C.… … Wikipedia
genus Tanacetum — noun a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum • Syn: ↑Tanacetum • Hypernyms: ↑asterid dicot genus • Member Holonyms: ↑Compositae, ↑family Compositae, ↑ … Useful english dictionary
pyrethrum — [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.… … English new terms dictionary
pyrethrum — The root of Anacyclus p. (family Compositae), a shrub native to Morocco; has been used as a sialogogue; its flowers are a source of pyrethrins. [G. pyrethron, feverfew, fr. pyr, fire, from the hot tasting root] * * * py·re·thrum pī rē thrəm, reth … Medical dictionary
genus Anacyclus — noun a Spanish pellitory • Syn: ↑Anacyclus • Hypernyms: ↑asterid dicot genus • Member Holonyms: ↑Compositae, ↑family Compositae, ↑Asteraceae, ↑family Asteraceae, ↑ … Useful english dictionary
pyrethrum — /paɪˈriθrəm / (say puy reethruhm) noun 1. a name given by horticulturalists to certain species of the genus Chrysanthemum, especially C. coccineum and its many cultivated varieties. 2. an insecticide prepared from the dried heads of C. coccineum …
Pyrethrum — n. 1 any of several aromatic chrysanthemums of the genus Tanacetum, esp. T. coccineum. 2 an insecticide made from the dried flowers of these plants, esp. Tanacetum cinerariifolium. Etymology: L f. Gk purethron feverfew … Useful english dictionary
pyrethrum — n. 1 any of several aromatic chrysanthemums of the genus Tanacetum, esp. T. coccineum. 2 an insecticide made from the dried flowers of these plants, esp. Tanacetum cinerariifolium. Etymology: L f. Gk purethron feverfew … Useful english dictionary
asterid dicot genus — noun genus of more or less advanced dicotyledonous herbs and some trees and shrubs • Hypernyms: ↑dicot genus, ↑magnoliopsid genus • Hyponyms: ↑genus Achillea, ↑Acroclinium, ↑genus Acroclinium, ↑Ageratina, ↑ … Useful english dictionary
