proline
/ˈpɹəʊliːn/noun
proline is spelled P-R-O-L-I-N-E: 7 letters. It appears about once in every 4 million words in written English, the 56,108th most frequent word form (wordfreq, 2021 data). As a noun, proline means “A nonessential amino acid C₅H₉NO₂ found in most animal proteins, especially collagen; its cyclic structure leads to kinks in the peptide chain of…” (English Wiktionary, September 2026). The plural of proline is prolines.
How many letters and syllables are in proline?
| Letters | 7: P-R-O-L-I-N-E |
|---|---|
| In writing | about once in every 4 million words; the 56,108th 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 proline?
Proline appears about once in every 4 million words in written English, the 56,108th 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 proline?
- /ˈpɹəʊliːn/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Tesco250-proline.wav, Wikimedia Commons (author and licence on each file's page).
Forms of proline
- prolines plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does proline mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A nonessential amino acid C₅H₉NO₂ found in most animal proteins, especially collagen; its cyclic structure leads to kinks in the peptide chain of proteins.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Proline in Spanish, French, German and Portuguese
In the sense nonessential amino acid; C5H9NO2:
| Language | Words |
|---|---|
| French | proline |
| German | Prolin |
| Spanish | prolina |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does proline come from?
Short for pyrrolidine.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).