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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.