pyrethrum

[pahy-ree-thruhm, -reth-ruhm]
noun
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. cinerariifolium, or C. coccineum, cultivated as a source of insecticides.
3.
Pharmacology. the dried flower heads of these plants, used chiefly as an insecticide and sometimes in medicine for certain skin disorders.

Origin:
1555–65; < Latin: pellitory < Greek pýrethron, akin to pyretós fever; compare pellitory

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To pyrethrum
Collins
World English Dictionary
pyrethrum (paɪˈriːθrəm)
 
n
1.  any of several cultivated Eurasian chrysanthemums, such as Chrysanthemum coccineum and C. roseum, with white, pink, red, or purple flowers
2.  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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Example sentences
For example, pyrethrum is a pesticide approved for both plant and animal production.
Adult mosquitoes are controlled with pyrethrum or organophosphate based products.
Pyrethrum is a naturally occurring mixture of chemicals found in certain chrysanthemum flowers.
Related Words
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature