Definitions for pyrethrin
paɪˈri θrɪn, -ˈrɛθ rɪnpyrethrin

WiktionaryRate this definition:0.0 / 0 votes

1. pyrethrinnoun

   Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring.

WikipediaRate this definition:0.0 / 0 votes

1. Pyrethrin

   The pyrethrins are a class of organic compounds normally derived from Chrysanthemum cinerariifolium that have potent insecticidal activity by targeting the nervous systems of insects. Pyrethrin naturally occurs in chrysanthemum flowers and is often considered an organic insecticide when it is not combined with piperonyl butoxide or other synthetic adjuvants. Their insecticidal and insect-repellent properties have been known and used for thousands of years. Pyrethrins are gradually replacing organophosphates and organochlorides as the pesticides of choice as the latter compounds have been shown to have significant and persistent toxic effects to humans.They first appeared on markets in the 1900's and have been continually used since then in products such as bug bombs, building insect sprays, and even to spray animals so that they do not get infectious diseases

Webster DictionaryRate this definition:0.0 / 0 votes

1. Pyrethrinnoun

   a substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor

2. Etymology: [NL. Pyrethrum, generic name of feverfew, Gr. feverfew.]

WikidataRate this definition:0.0 / 0 votes

1. Pyrethrin

   The pyrethrins are a pair of natural organic compounds normally derived from Chrysanthemum cinerariifolium that have potent insecticidal activity. Pyrethrins are neurotoxins that attack the nervous systems of all insects. When present in amounts not fatal to insects, they still appear to have an insect repellent effect. Pyrethrins are gradually replacing organophosphates and organochlorides as the pesticide of first choice. They are non-persistent, being biodegradable, and break down on exposure to light or oxygen. The chemical structure of pyrethrins inspired the production of a variety of synthetic insecticides called pyrethroids such as bifenthrin, permethrin, and cypermethrin.

How to pronounce pyrethrin?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say pyrethrin in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of pyrethrin in Chaldean Numerology is: 6

2. Pythagorean Numerology

   The numerical value of pyrethrin in Pythagorean Numerology is: 7

Examples of pyrethrin in a Sentence

1. Kyong Sup Yoon:

   It's almost saturated with [these genes], which means that people using permethrin and pyrethrin based products will probably have a very hard time controlling the lice.

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References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Pyrethrin
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Pyrethrin
3. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/pyrethrin
4. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=pyrethrin