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Definition of Pyrethrum
1. Noun. Made of dried flower heads of pyrethrum plants.
2. 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.
Group relationships: Genus Tanacetum, Tanacetum
Generic synonyms: Herb, Herbaceous Plant
3. Noun. Spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum.
Generic synonyms: Flower
Group relationships: Genus Tanacetum, Tanacetum
4. Noun. Used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum.
Generic synonyms: Asterid Dicot Genus
Group relationships: Aster Family, Asteraceae, Compositae, Family Asteraceae, Family Compositae
Definition of Pyrethrum
1. Noun. Any of several perennial African plants of the genus ''Chrysanthemum, especially ''Chrysanthemum cinerariaefolium'' ¹
2. Noun. (organic compound) Any of several insecticides obtained from these plants; pyrethrin ¹
¹ Source: wiktionary.com
Definition of Pyrethrum
1. [n -S]
Lexicographical Neighbors of Pyrethrum
Literary usage of Pyrethrum
Below you will find example usage of this term as found in modern and/or classical literature:
1. Preventive medicine and hygiene by Milton Joseph Rosenau (1917)
"Pyrethrum powder should be distributed in pots or pans and set on fire with ...
Much of the pyrethrum upon the market is impure, which further weakens what ..."
2. Proceedings of the American Pharmaceutical Association at the Annual Meeting by American Pharmaceutical Association, National Pharmaceutical Convention, American Pharmaceutical Association Meeting (1872)
"We have greater faith in pyrethrum roseum than in any other species. ... It may
not be known that the pyrethrum roseum is a hardy plant which can be easily ..."
3. The House Fly, Disease Carrier: An Account of Its Dangerous Activities and by Leland Ossian Howard (1911)
"Pyrethrum and Carbolic Acid The fly-fighting committee of the American Civic
Association recommend the burning of pyrethrum powder and also the dropping of ..."
4. Favourite Flowers of Garden and Greenhouse by Edward Step (1897)
"Genus Pyrethrum Pyrethrum (from the classical Greek name for the plants, ...
The chief characters by which Pyrethrum is distinguished from Chrysanthemum ..."
5. The Practitioner by Gale Group, ProQuest Information and Learning Company (1884)
"He gives from ten to twenty drops of the tincture of pyrethrum four times a day.
... Pyrethrum for Globus Hystericus.—Dr. Both regards •—Dr. Weill calls ..."
6. Vegetable Gardening by Samuel Bowdlear Green (1915)
"INSECTICIDES AND OTHER INSECT DESTROYERS Pyrethrum is the insect powder of the
... It is made by grinding the flowers of the pyrethrum plant, which closely ..."
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