One of the mysteries of the English language finally explained.
A synthetic insecticide of the pyrethroid class, used chiefly against disease-carrying insects.
- ‘Common treatments for head lice include permethrin and lindane.’
- ‘Experts consider permethrin the treatment of choice.’
- ‘Pyrethrins and permethrin have a similar mode of activity.’
- ‘Spray your clothing with permethrin insecticide spray.’
- ‘Put bug spray with permethrin on your boots and clothes.’
1970s: from per- (sense 2) + (res)methrin, denoting a synthetic pyrethroid.
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