pyrethrum : Idioms & Phrases
anacyclus pyrethrum
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noun a small Mediterranean plant containing a volatile oil once used to relieve toothache
pellitory-of-Spain; pellitory.
WordNet
dalmatia pyrethrum
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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
Dalmatia pyrethrum; Tanacetum cinerariifolium; Chrysanthemum cinerariifolium; pyrethrum.
WordNet
dalmatian pyrethrum
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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
Dalmatia pyrethrum; Tanacetum cinerariifolium; Chrysanthemum cinerariifolium; pyrethrum.
WordNet
genus pyrethrum
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noun used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
Pyrethrum.