permethrin
noun
permethrin is spelled P-E-R-M-E-T-H-R-I-N: 10 letters. It appears about once in every 12 million words in written English, the 103,949th most frequent word form (wordfreq, 2021 data). As a noun, permethrin means “A synthetic insecticide, C₂₁H₂₀Cl₂O₃, used to treat head lice, nits, and scabies; as an active ingredient in flea collars; and to eradicate woodworm…” (English Wiktionary, September 2026). The plural of permethrin is permethrins.
How many letters and syllables are in permethrin?
| Letters | 10: P-E-R-M-E-T-H-R-I-N |
|---|---|
| In writing | about once in every 12 million words; the 103,949th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is permethrin?
Permethrin appears about once in every 12 million words in written English, the 103,949th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Forms of permethrin
- permethrins plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does permethrin mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A synthetic insecticide, C₂₁H₂₀Cl₂O₃, used to treat head lice, nits, and scabies; as an active ingredient in flea collars; and to eradicate woodworm infestations.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does permethrin come from?
From Latin perme(ō) (“to pervade”) + English -thrin.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).