Definition of Pirethrin
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.
- Webster's Unabridged Dictionary (1913)
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