pyrethrum
/paɪˈɹiθɹəm/noun
pyrethrum is spelled P-Y-R-E-T-H-R-U-M: 9 letters. It appears about once in every 32 million words in written English, the 171,907th most frequent word form (wordfreq, 2021 data). As a noun, pyrethrum means “Any of several daisy-like perennial African plants of the genus Tanacetum, especially Tanacetum cinerariifolium” (English Wiktionary, September 2026). The plural of pyrethrum is pyrethrums.
How many letters and syllables are in pyrethrum?
| Letters | 9: P-Y-R-E-T-H-R-U-M |
|---|---|
| In writing | about once in every 32 million words; the 171,907th 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 pyrethrum?
Pyrethrum appears about once in every 32 million words in written English, the 171,907th 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).
How do you pronounce pyrethrum?
- US /paɪˈɹiθɹəm/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of pyrethrum
- pyrethrums plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does pyrethrum mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
Any of several daisy-like perennial African plants of the genus Tanacetum, especially Tanacetum cinerariifolium.
- 2
Anacyclus pyrethrum (pellitory of Spain)
- 3
Any of several insecticides obtained from these plants; pyrethrin.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does pyrethrum come from?
From Old English pyretre, from (and later reformed after) Latin pyrethrum (in Pliny), from Hellenistic Ancient Greek πύρεθρον (púrethron).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).