[n] - made of dried flower heads of pyrethrum plants 2. [n] - white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below 3. [n] - used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
Found op http://www.webdictionary.co.uk/definition.php?query=Pyrethrum
(= pyrethroid) Toxic hydrocarbon, originally from chrysanthemum flowers, that now forms the basis for a wide range of â€˜natural` synthetic pyrethroid insecticides.
Found op http://www.encyclo.co.uk/visitor-contributions.php
<plant biology> A natural insecticide that is extracted from chrysanthemums. It is atoxic, nonvolatile hydrocarbon related to kerosene. ... (09 Oct 1997) ...
Found op http://www.mondofacto.com/facts/dictionary?pyrethrum
genus Pyrethrum noun used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
Found op http://wordnetweb.princeton.edu/perl/webwn?s=Pyrethrum
Dalmatia pyrethrum noun white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
Found op http://wordnetweb.princeton.edu/perl/webwn?s=pyrethrum
any of certain plant species of the genus Tanacetum, native to southwestern Asia, whose aromatic flower heads, when powdered, constitute the active ... [2 related articles]
Found op http://www.britannica.com/eb/a-z/p/137
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. Pyrethrum is also the name of a natural insecticide made from the dried flower heads of C. cinerariifolium and C. coccineum. Some members of...
Found op http://en.wikipedia.org/wiki/Pyrethrum
pyrethrum (pīrē'thrum) : see chrysanthemum.
Found op http://www.infoplease.com/ce6/sci/A0917868.html
Pyrethrum is a genus of herbaceous composite plants, the distinctive features of which are that the pappus consists of an elevated membranous border, and the achenes are angular but not winged.
Found op http://www.probertencyclopaedia.com/browse/BPA.HTM
Type: Term Pronunciation: pī-rē′thrŭm Definitions: 1. The root of Anacyclus pyrethrum (family Compositae), a shrub native to Morocco; has been used as a sialogogue; its flowers are a source of pyrethrins.
Found op http://www.medilexicon.com/medicaldictionary.php?t=74472
Popular name for several cultivated chrysanthemums. The ornamental species C. coccineum, and hybrids derived from it, are commonly grown in gardens. Pyrethrum powder, made from the dried flower heads of some species, is a powerful pesticide for aphids and mosquitoes. (Genus Chrysanthemum
Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0015078.html
1) Insect powder 2) Insecticide
Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/pyrethrum/1
Tip: double click on a word to show its meaning.
No exact matches found.
Typ a word and hit `Search`.
The most recent searches on Encyclo. Between brackets you will find the number of results and number of related results.
• powerful (9)
• philothermic (1)
• Chenda, Sanming (1)
• Cytogenous (4)
• polysaccharide lyases (1)
• unairable (1)
• Topic (10)
• Yaransk (1)
• Pinacosaurus (5)
• tutti (8)
• New South Wales Breake (1)
• ifgr (2)
• ninth cranial nerve (2)
• Pierre Bordier (1)
• Zabaism (1)
• mastigomycotina (2)
• Automolos (1)
• Zyklon (3)
• Book of Songs, The (1)
• incisura clavicularis (2)
• Krieger Peak (1)
• Bellingham Festival (1)
• Consulage (2)
• Exposition Manager (1)