pyrethrin
noun
pyrethrin is spelled P-Y-R-E-T-H-R-I-N: 9 letters. It appears about once in every 49 million words in written English, the 217,360th most frequent word form (wordfreq, 2021 data). As a noun, pyrethrin means “Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring” (English Wiktionary, September 2026). The plural of pyrethrin is pyrethrins.
How many letters and syllables are in pyrethrin?
| Letters | 9: P-Y-R-E-T-H-R-I-N |
|---|---|
| In writing | about once in every 49 million words; the 217,360th 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 pyrethrin?
Pyrethrin appears about once in every 49 million words in written English, the 217,360th 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 pyrethrin
- pyrethrins plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does pyrethrin mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does pyrethrin come from?
From pyrethrum + -in.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).