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Definition of pyrethrum
1 : any of several chrysanthemums with finely divided often aromatic leaves including ornamentals as well as important sources of insecticides
2 : an insecticide made from the dried heads of any of several Old World chrysanthemums (especially Chrysanthemum cinerariaefolium)
From the M-W Editors
Origin and Etymology of pyrethrum
Latin, pellitory, from Greek pyrethron, from pyr fire
Medical Dictionary
Medical Definition of pyrethrum
1: any of several chrysanthemums with finely divided often aromatic leaves including ornamentals as well as important sources of insecticides
2: an insecticide consisting of or derived from the dried heads of any of several Old World chrysanthemums (genus Chrysanthemum of the family Compositae)
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Britannica.com: Encyclopedia article about pyrethrum
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