Dictionary

pyrethrum

noun py·re·thrum \pī-ˈrē-thrəm, -ˈre-\

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)
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Origin of PYRETHRUM

Latin, pellitory, from Greek pyrethron, from pyr fire
First Known Use: circa 1543
Medical Dictionary

pyrethrum

noun py·re·thrum \pī-ˈrē-thrəm, -ˈreth-rəm\

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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