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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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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.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'pyrethrin'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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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