Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Either of two viscous liquid esters, C21H28O3 or C22H28O5, that are extracted from pyrethrum flowers and used as insecticides.
from The Century Dictionary.
- noun A resinous compound found in pellitory resin from the root of Anacyclus Pyrethrum.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also
Pyrethrum camphor .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry Any of a number of naturally occurring
insecticides extracted from thepyrethrum plant; unusual in having acyclopropane ring.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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Pyrethroid Pesticides were developed as a synthetic version of the naturally occurring pesticide pyrethrin, which is found in chrysanthemums.
Types of pesticides 2008
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Hackett says the problem is a long-acting insecticide called pyrethrin, also called permethrin.
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These effects are due to "pyrethrin" contained in the plant, which is an acid fixed resin; also there are present a second resin, and a yellow, acrid oil, whilst the root contains inulin, tannin, and other substances.
Herbal Simples Approved for Modern Uses of Cure William Thomas Fernie
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The best products for elimination of fleas outdoors are formulations that contain a knockdown material such as pyrethrin or permethrin plus an insect growth regulator (pyriproxyfen or methoprene) to inhibit larval maturation.
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A natural insecticide, "pyrethrin" is judged as the most effective and least harmful insecticide to mammals,
WN.com - Articles related to David Johansen never takes a holiday 2009
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The recommended treatment is pyrethrin, used when leaves first show damage.
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Piperonyl butoxide (a chemical used with pyrethrin and similar pesticides to kill wasps, ants, fleas and ticks, lice and other pests) was found in 52% of homes.
Dan Shapley: 8 Pesticides In Your Own Kitchen (Whether You Use Pesticides or Not) 2009
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Load up your portable tanks with as much pyrethrin as necessary, spray liberally in the general direction of the GOP caucus nest, and stop asking for advice from ..
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Still, keep Raid away from kitty: Cats' livers can't process pyrethrin fast enough to keep from, you know, dying.
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Piperonyl Butoxide or N-Octyl Bicycloheptene Dicarboximide Not poisons on their own, these so-called pesticide synergists block the enzyme that breaks down pyrethrin in insects.
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