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pyrethrum vs. pyrethrin
[ pahy-ree-thruhm, -reth-ruhm ]
noun
- any of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers, cultivated as an ornamental.
- any of several chrysanthemums, as C. cinerariifolium, or C. coccineum, cultivated as a source of insecticides.
- the dried flower heads of these plants, used chiefly as an insecticide and sometimes in medicine for certain skin disorders.
[ pahy-ree-thrin, -reth-rin ]
noun
- a viscous, water-insoluble liquid, C21H28O3, extracted from pyrethrum flowers, used as an insecticide.
- a like compound, C22H28O5, obtained and used similarly.