PYRETHRUM

Pyrethrum, genus Pyrethrum

(noun) used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum

pyrethrum, Dalmatian pyrethrum, Dalmatia pyrethrum, Tanacetum cinerariifolium, Chrysanthemum cinerariifolium

(noun) white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum

pyrethrum

(noun) made of dried flower heads of pyrethrum plants

Source: WordNet® 3.1

Etymology

Noun

pyrethrum (countable and uncountable, plural pyrethrums)

Any of several daisy-like perennial African plants of the genus Tanacetum, especially Tanacetum cinerariifolium. [from 10th c.]

Anacyclus pyrethrum (pellitory of Spain)

(organic compound) Any of several insecticides obtained from these plants; pyrethrin.

Source: Wiktionary

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