Definition of pyrethrin
English to English noun - A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor.
source: Webster 1913
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pyrethrin, pyrethrine, pyrethrum, pretorian, praetorian, predetermine, pretorium, prototherian, praetorium, preterhuman, periuterine, proturan, parathormone, pear hawthorn, power train, pyritohedron, periderm, peritreme, peridrome, prodrome
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