Copyright © Philip M. Parker, INSEAD. Terms of Use.
Definition: Pyrethrum |
PyrethrumNoun1. Made of dried flower heads of pyrethrum plants. 2. White-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum. 3. Spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum. 4. Used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum. Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. |
| Domain | Definition |
Health | Species cinerafolium vis. and coccineum willd. of the genus Chrysanthemum (Compositae). The flowers contain pyrethrins, cinerolones, and chrysanthemines which are powerful contact insecticides. (references) |
Source: compiled by the editor from various references; see credits. | |
(From Wikipedia, the free Encyclopedia)
The flower is good for use as a long-lasting cut flower. The plant will re-bloom in late summer if pruned.
The plant is economically important as a natural source of insecticide. The flowers are pulverized and the active components, a group of esters called pyrethrins (C21H28O3, or C22H28O5) contained in the seed cases, are extracted and sold in the form of an oleoresin. This is applied as a suspension in water or oil, or as a powder. Pyrethrins attack the nervous systems of all insects, and inhibit female mosquitoes from biting. When not present in amounts fatal to insects, they still appear to have a repellent effect. They are harmful to fish, but are far less toxic to mammals and birds than many synthetic insecticides and are non-persistent, being biodegradable and also breaking down easily on exposure to light. They are considered to be amongst the safest insecticides for use around food.
Kenya produced 90% (over 6,000 tons) of the world's pyrethrum in 1998, but production in Tasmania is now increasing.
Pyrethroids are synthetic insecticides based on natural pyrethrum: an example of one is permethrin. A common formulation of pyrethrin is in preparations containing the synthetic chemical Piperonyl Butoxide: this has the effect of enhancing the toxicity to insects and speeding the effects when compared with pyrethrins used alone. These formulations are known as synergized pyrethrins
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Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Pyrethrum."
Synonyms: PyrethrumSynonyms: genus Pyrethrum (n), painted daisy (n). (additional references) |
Crosswords: Pyrethrum |
| English words defined with "pyrethrum": Bertram ♦ Chrysanthemum cinerariifolium ♦ Dalmatia pyrethrum, Dalmatian pyrethrum ♦ Pyrethrin, Pyrethrine ♦ Tanacetum cinerariifolium. (references) |
| Specialty definitions using "pyrethrum": Pyrethrins. (references) |
| Etymologies containing "pyrethrum": Pyrethrin. (references) |
| Domain | Title |
Books | |
Source: compiled by the editor from various references; see credits. | |
| Thumbnail | Description & Credit | Thumbnail | Description & Credit |
 | [Malaria control- native use of pyrethrum bomb]. Credit: National Library of Medicine. |  | Five African women, one carrying a child on her back, picking pyrethrum flowers, Kenya. Credit: Library of Congress. |
Source: pictures compiled by the editor from various references; see picture credits. | |||
| Subject | Topic | Quote |
Economic History | Tanzania | Cash crops, including coffee, tea, cotton, cashews, sisal, cloves, and pyrethrum account for the vast majority of export earnings. (references) |
Kenya | Trade (2000): Exports--$1.8 billion: tea, coffee, horticultural products, petroleum products, cement, pyrethrum, soda ash, sisal, hides and skins, fluorspar. (references) | |
Rwanda | Trade (1996 est.): Exports--$69.4 million: coffee, tea, hides and skins, cassiterite, pyrethrum. (references) | |
Source: compiled by the editor from ICON Group International, Inc.; see credits. | ||
| "Pyrethrum" is generally used as a noun (singular) -- approximately 100.00% of the time. "Pyrethrum" is used about 5 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted) |
| Parts of Speech | Percent | Usage per 100 Million Words | Rank in English |
| Noun (singular) | 100% | 5 | 157,705 |
Source: compiled by the editor from several corpora; see credits.
Expressions using "pyrethrum": Anacyclus Pyrethrum ♦ Dalmatia pyrethrum ♦ dalmatian pyrethrum ♦ genus Pyrethrum ♦ pyrethrum camphor ♦ Pyrethrum or Chrysanthemum Parthenium ♦ pyrethrum Parthenium ♦ pyrethrum powder. Additional references. | |
| Hyphenated Usage | |
Beginning with "pyrethrum": pyrethrum-based. | |
| Source: compiled by the editor from various references; see credits. | |
| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Expression | Frequency per Day |
pyrethrum | 109 |
houston pyrethrum | 5 |
natural pyrethrum | 3 |
pyrethrum flower | 3 |
aerosol pyrethrum | 2 |
pyrethrum toxicity | 2 |
| Source: compiled by the editor from various references; see credits. | |
| Language | Translations for "pyrethrum"; alternative meanings/domain in parentheses. | ||||||||||||||||||||||||||||
Bulgarian | пиретрум. (various references) | ||||||||||||||||||||||||||||
Chinese | 除虫菊植. (various references) | ||||||||||||||||||||||||||||
Danish | pyrethrum. (various references) | ||||||||||||||||||||||||||||
Dutch | pyrethrumbloemen, pyrethrum. (various references) | ||||||||||||||||||||||||||||
French | pyrèthre. (various references) | ||||||||||||||||||||||||||||
German | Pyrethrum. (various references) | ||||||||||||||||||||||||||||
Greek | πύρεθρο. (various references) | ||||||||||||||||||||||||||||
Italian | piretro. (various references) | ||||||||||||||||||||||||||||
Japanese Kanji | 除虫菊 . (various references) | ||||||||||||||||||||||||||||
Japanese Katakana | じょちゅうぎく. (various references) | ||||||||||||||||||||||||||||
Manx | lus yn aile (salad burnet). (various references) | ||||||||||||||||||||||||||||
Pig Latin | yrethrumpay piretro. (various references) pelitre (pellitory of spain). (various references) pire out. (various references) піретрум. (various references) | ||||||||||||||||||||||||||||
| Language | Period | Translations |
| Latin | 500 BCE-Modern | Anacyclus pyrethrum, Chrysanthemum cinerariaefolium. (various references) |
| Source: compiled by the editor from various references. | ||
Derivations | |
Words beginning with "pyrethrum": pyrethrums. (additional references) | |
| |
"Pyrethrum" is suggested in spellcheckers for the following: pyretheum. (additional references) | |
| Source: compiled by the editor, based on several corpora (additional references). | |
Scrabble® Enable2K-Verified Anagrams | |
| Words within the letters "e-h-m-p-r-r-t-u-y" | |
-1 letter: trumpery. | |
-2 letters: murther, thumper. | |
-3 letters: hurter, murphy, murrey, rheumy, rhymer. | |
-4 letters: empty, erupt, hempy, herry, humpy, hurry, hyper, merry, murre, murry, muter, myrrh, perry, pryer, purer, retry, rheum, rhyme, terry, therm, thrum, thump, thyme, truer, trump, tuyer. | |
-5 letters: hemp, herm, hump, hurt, hype, hyte, meth, mure, murr, mute, myth, perm, pert, phut, prey, pure, purr. | |
| Words containing the letters "e-h-m-p-r-r-t-u-y" | |
+1 letter: pyrethrums. | |
| Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. | |
| 1. Definition 2. Synonyms 3. Crosswords 4. Usage: Commercial | 5. Images: Slideshow 6. Images: Photo Album 7. Quotations: Non-fiction 8. Usage Frequency | 9. Expressions 10. Expressions: Internet 11. Translations: Modern 12. Translations: Ancient | 13. Derivations 14. Anagrams 15. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
