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Definition of: pyrethrum
(pī·reth′rəm, -rē′thrəm) noun
1. The dried and powdered roots of the pellitory used in medicine as a sialogog and rube-facient.
2. The powdered flowers of a chrysanthemum (Chrysanthemum cinerariaefolium), used medically as an ointment, and as an insecticide. [<L, feverfew <Gk. pyrethron <pyr fire]
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