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1 Any of several plants of the genus Chrysanthemum, especially C. cinerariifolium, grown for its flowers and seed cases, which contain natural insecticidal compounds (pyrethrins). Various synthetic insecticides – the pyrethroids – are chemically similar to pyrethrins. Examples include permethrin and cypermethrin. The pyrethrins penetrate the insect's cuticle and are fast-acting, nontoxic to many animals (although fish are highly susceptible) and to plants, and readily biodegradable.

2 An insecticidal preparation containing natural pyrethrins.

Subjects: Biological Sciences.

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