permethrin

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English

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Etymology

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Latin perme(ō) (“to pervade”) +‎ -thrin.

Noun

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permethrin (countable and uncountable, plural permethrins)

  1. A synthetic insecticide, C₂₁H₂₀Cl₂O₃, used to treat head lice, nits, scabies, and in flea collars.

Further reading

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