pyrethrum


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Related to pyrethrum: pyrethrin

py·re·thrum

 (pī-rē′thrəm, -rĕth′rəm)
n.
1.
a. A Eurasian perennial plant (Tanacetum coccineum) in the composite family, cultivated for its colorful flower heads and formerly used as a source of an insecticide. Also called painted daisy.
b. A closely related perennial plant (Tanacetum cinerariifolium), commercially cultivated as the source of an insecticide.
2. An insecticide made from the dried flower heads of any of these plants.

[Latin, pellitory (Anacyclus pyrethrum), from Greek purethron, from pūr, fire (from its warming effect); see pyretic.]

pyrethrum

(paɪˈriːθrəm)
n
1. (Plants) any of several cultivated Eurasian chrysanthemums, such as Chrysanthemum coccineum and C. roseum, with white, pink, red, or purple flowers
2. (Elements & Compounds) any insecticide prepared from the dried flowers of any of these plants, esp C. roseum
[C16: via Latin from Greek purethron feverfew, probably from puretos fever; see pyretic]

py•re•thrum

(paɪˈri θrəm, -ˈrɛθ rəm)

n., pl. -thrums, -thrum.
1. any of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers.
2. the dried flower heads of some of these plants, used as an insecticide and in medicine for certain skin disorders.
[1555–65; < Latin: pellitory]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pyrethrum - made of dried flower heads of pyrethrum plants
insect powder, insecticide - a chemical used to kill insects
2.pyrethrum - white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
genus Tanacetum, Tanacetum - a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum
herb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
3.pyrethrum - spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowerspyrethrum - 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
flower - a plant cultivated for its blooms or blossoms
genus Tanacetum, Tanacetum - a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum
4.Pyrethrum - used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
asterid dicot genus - genus of more or less advanced dicotyledonous herbs and some trees and shrubs
aster family, Asteraceae, Compositae, family Asteraceae, family Compositae - plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia
Translations

pyrethrum

[paɪˈriːθrəm] Npiretro m
References in periodicals archive ?
This region is rich in agriculture because we have milk, Irish potatoes, pyrethrum and Merino sheep, but there will be no meaningful development without peace," Prof Lonyangapuo said.
Whether you speak of tea or coffee or cotton or sugarcane or pyrethrum or cashew nuts - these all require an external market, whether local or global, for the farmers to sell their produce.
Tenders are invited for Supply and delivery if pyrethrum 2%, King fog, Cyphemthrin 5%, Amitha, Technical malathion and waste oil to health section in tirupati municipal town for 6 months
Pesticide-based remedies, the most common lice treatments, contain the active in gredients permethrin or pyrethrum, which are pesticides introduced more than four decades ago as pediculicides -- O-T-C drugs to kill lice.
Pyrethrum, for example, is derived from chrysanthemums and can be used on Certified Organic farms.
Pyrethrums are organic products, created from the plant oil in the pyrethrum daisy.
The chemicals -- pyrethrum, malathion and alpha- cypher are hazardous to health and large amounts of diesel sprayed at ' nose level' is a major cause of air pollution.
In particular, the Dalmatian chrysanthemum, or Tanacetum cinerariifolium, is an important source of the natural botanical insecticide, pyrethrum.
Infestations should be treated with the insecticide pyrethrum, which comes in various garden brands.
The plant Anacyclus pyrethrum (AP) consists of several N-alkylamides with pellitorine as main constituent.
TM] Ingram and De Meillon [11] confirmed the insecticidal properties of pyrethrum, while De Meillon [12,13] demonstrated the powerful influence that indoor spraying with pyrethrum would have on malaria transmission (see below), this being the forerunner of the World Health Organization's (WHO's) global malaria eradication campaign over 20 years later.