Definition of pyrethrin
: either of two oily liquid esters C21H28O3 and C22H28O5 having insecticidal properties and occurring especially in the flowers of pyrethrum
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Recent Examples of pyrethrin from the Web
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Most wasp killers contain pyrethrins, which are derived from botanical sources.
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The Extension recommends using a fast-acting aerosol insecticide containing pyrethrins if fire ants are detected among flood debris, though these insecticides can be toxic to aquatic organisms, so caution is recommended.
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Pyrethrins and pyrethroids also work by interfering with sodium pores.
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Origin and Etymology of pyrethrin
International Scientific Vocabulary, from Latin pyrethrum
Medical Dictionary
Learn More about pyrethrin
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Britannica.com: Encyclopedia article about pyrethrin
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