Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of pyrethrin is as below...

Pyrethrine :: Pyrethrine (n.) An alkaloid extracted from the root of the pellitory of Spain (Anacyclus pyrethrum).

Pyrethrin :: Pyrethrin (n.) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor..

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