pyrethrum

Pronunciation: /paɪˈɹiθɹəm/

The English word “pyrethrum” has 3 meanings listed here.

noun

Any of several daisy-like perennial African plants of the genus Tanacetum, especially Tanacetum cinerariifolium.
Anacyclus pyrethrum (pellitory of Spain)
Any of several insecticides obtained from these plants; pyrethrin.

From Old English pyretre, from (and later reformed after) Latin pyrethrum (in Pliny), from Hellenistic Ancient Greek πύρεθρον (púrethron).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.