- pyrethrin
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Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring.
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Pyrethrin — Pyr eth*rin, n. [NL. Pyrethrum, generic name of feverfew, Gr. ? feverfew.] (Chem.) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; called also {Pyrethrum camphor}. [1913 Webster] … The Collaborative International Dictionary of English
Pyrethrin — Pyrethrin, angeblich ein eigenthümlicher Stoff in der Bertramwurzel … Pierer's Universal-Lexikon
pyrethrin — [pī reth′rin, pīrē′thrin] n. [< PYRETHRUM + IN1] either of two liquid esters, C21H28O3 or C22H28O5, derived from chrysanthemums: the active ingredient of pyrethrum … English World dictionary
Pyrethrin — Strukturformel siehe unter Zusammensetzung Allgemeines Name Pyrethrine Summenformel keine, da Stoffgruppe CAS Nummer 8003 34 7 Kurzbeschreibung … Deutsch Wikipedia
Pyrethrin — The pyrethrins are a pair of natural organic compounds that have potent insecticidal activity. Pyrethrin I and pyrethrin II are structurally related esters with a cyclopropane core. [ Merck Index , Eleventh Edition, 7978.] [McGraw Hill Ryerson… … Wikipedia
pyrethrin — /puy ree thrin, reth rin/, n. Chem. 1. Also called pyrethrin I. a viscous, water insoluble liquid, C21H28O3, extracted from pyrethrum flowers, used as an insecticide. 2. Also called pyrethrin II. a like compound, C22H28O5, obtained and used… … Universalium
pyrethrin — py·re·thrin pī rē thrən, reth rən n either of two oily liquid esters C21H28O3 and C22H28O5 that have insecticidal properties and are the active components of pyrethrum * * * py·reth·rin (pi rethґrin) either of two esters, pyrethrin I and… … Medical dictionary
pyrethrin — /paɪˈriθrən/ (say puy reethruhn) noun either of two compounds, C21H28O3 (pyrethrin 1), or C22H28O5 (pyrethrin 2), which are obtained from pyrethrum flowers and are used as contact insecticides. {pyrethr(um) + in2} …
pyrethrin — noun Etymology: International Scientific Vocabulary, from Latin pyrethrum Date: 1871 either of two oily liquid esters C21H28O3 and C22H28O5 having insecticidal properties and occurring especially in the flowers of pyrethrum … New Collegiate Dictionary
Pyrethrin — Py|re|th|rin [nlat. Pyrethrum (↑ Pyro ), heute: Chrysanthemum = Wucherblumenart (Bot.); ↑ in (3)], das; s, e: ↑ Pyrethroid … Universal-Lexikon
