pyrethrum vs. pyrethrin
noun
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any of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers, cultivated as an ornamental.
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any of several chrysanthemums, as C. cinerariifolium, or C. coccineum, cultivated as a source of insecticides.
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Pharmacology. the dried flower heads of these plants, used chiefly as an insecticide and sometimes in medicine for certain skin disorders.
noun
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Also called pyrethrin I. a viscous, water-insoluble liquid, C 2 1 H 2 8 O 3 , extracted from pyrethrum flowers, used as an insecticide.
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Also called pyrethrin II. a like compound, C 2 2 H 2 8 O 5 , obtained and used similarly.
