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py·reth·rin (pi-rethґrin) either of two esters, pyrethrin I and pyrethrin II, found in the flowers of certain species of Chrysanthemum, used alone or in combination with piperonyl butoxide as an insecticide and topical pediculicide. See also pyrethrum extract, under extract.Medical dictionary. 2011.
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 — /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 — noun Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring … Wiktionary
Pyrethrin — Py|re|th|rin [nlat. Pyrethrum (↑ Pyro ), heute: Chrysanthemum = Wucherblumenart (Bot.); ↑ in (3)], das; s, e: ↑ Pyrethroid … Universal-Lexikon
