permethrin.
A synthetic insecticide, C₂₁H₂₀Cl₂O₃, used to treat head lice, nits, and scabies; as an active ingredient in flea collars; and to eradicate woodworm infestations.
Meaning & usage
A synthetic insecticide, C₂₁H₂₀Cl₂O₃, used to treat head lice, nits, and scabies; as an active ingredient in flea collars; and to eradicate woodworm infestations.
Where this word comes from
Etymology tree Proto-Indo-European *per-der. Proto-Italic *peri- Latin per- Proto-Indo-European *mey- Proto-Indo-European *-os Proto-Indo-European *mey-o- Proto-Italic *mejo- Latin meō Latin perme(ō) English -thrin English permethrin From Latin perme(ō) (“to pervade”) + English -thrin.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.