One of the mysteries of the English language finally explained.
1An aromatic plant of the daisy family, typically having feathery foliage and brightly colored flowers.
Genus Tanacetum (formerly Chrysanthemum or Pyrethrum), family Compositae: several species, in particular T. coccineum, grown as an ornamental, and T. cinerariifolium, grown as a source of the insecticide pyrethrum
- ‘In some areas, extremely fertile soils produce coffee, tea, and pyrethrum (used in making insecticides).’
- ‘Others are synthetic versions of naturally-occurring insecticides, such as those found in the plant pyrethrum.’
- ‘This is the area where significant cash crops are grown, including pyrethrum (a flower that produces a natural insecticide), coffee and tea.’
- ‘Some are derived from plants, such as pyrethrum and neem.’
- ‘Not all herbs smell good - catmint, curry plant, pyrethrum, rue, santolina and tansy are all pretty pongy.’
- ‘When I looked closely I could see the truck had a PyGanic label with the iconic pyrethrum flower on the side.’
- 1.1 An insecticide made from the dried flowers of the pyrethrum plant.
- ‘Daisy plants were first used centuries ago as a lice remedy in the Middle East, and this led to the discovery of pyrethrum insecticides.’
- ‘By the mid 1800s, the heads of chrysanthemum flowers were used to obtain pyrethrum, and rotenone was extracted from the derris plant.’
- ‘Pesticides that are approved for organic farming include copper, sulfur, petroleum distillates, and pyrethrum.’
- ‘You can purchase concentrated pyrethrum from a nursery or the garden supply section of your supermarket.’
- ‘For body lice, use pyrethrum with piperonyl butoxide lotion over the whole body and wash off after 10 minutes.’
- ‘It seems probable that in the future, synthetic pyrethroids will be of more interest than pyrethrum as possible delousing agents.’
- ‘Adult mosquitoes were obtained from houses within a village by resting and pyrethrum knockdown collections.’
- ‘The spray does not control the adults, so you can either handpick the adults or spray them with pyrethrum insecticide.’
- ‘Geoff reckons to use a contact spray like pyrethrum which breaks down within about 24 hours.’
- ‘A natural pyrethrum insecticide is cheaper, less harmful and just as effective as those chemical poisons to kill spiders.’
- ‘‘That's pyrethrum,’ said Niko ‘it's used as an insecticide.’’
- ‘Rotenone and pyrethrum don't work, even if applied more frequently.’
- ‘You can treat them with pyrethrum, white oil, soapy water or just squash them with your fingers.’
Middle English (denoting pellitory): from Latin, from Greek purethron ‘feverfew’. The current senses (based on the former genus name) date from the late 19th century.
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