| 单词 | pyrethrum |
| 释义 | pyrethrum (once / 123118 pages) n WORD FAMILY pyrethrum: pyrethrums USAGE EXAMPLESSeventy-two percent of OTC lice products sold in the United States contain either permethrin or pyrethrum. US News(Nov 25, 2015) If you’re staying in accommodations that do not have good screens, I recommend getting mosquito nets and clothes impregnated with pyrethrum, a natural insect repellent. New York Times(Dec 26, 2012) In other cases pyrethrum or tobacco powder, wood ashes, etc., have been employed against insects. Ward, H. Marshall, Disease in Plants(2012) 1n white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum Syn|Hyper Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum cinerariifolium herb, herbaceous plant a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests 2n 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 Syn|Hyper Chrysanthemum coccineum, Tanacetum coccineum, painted daisy flower a plant cultivated for its blooms or blossoms 3n made of dried flower heads of pyrethrum plants Hyper insect powder, insecticide a chemical used to kill insects Pyrethrum (once / 227295 pages) n WORD FAMILY Pyrethrum: Pyrethrums USAGE EXAMPLESPyrethrum Parthenium aureum: half-hardy, 1 ft.; grown for its golden foliage, and much used for bedding. Various, Encyclopaedia Britannica, 11th Edit...(2012) Pyrethrum is a naturally occurring insecticide derived from the chrysanthemum; it has been used for at least 200 years. Scientific American(Aug 15, 2011) Pyrethrum powder, air-slacked lime, kerosene emulsion, etc., are used as remedies for lice. Anonymous, Farm Gardening with Hints on Cheap...(2011) n used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum Syn|Hyper genus Pyrethrum asterid dicot genus genus of more or less advanced dicotyledonous herbs and some trees and shrubs |
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