proline

P3R1O1L1I1N1E1
/ˈpɹəʊliːn/

noun

A nonessential amino acid C₅H₉NO₂ found in most animal proteins, especially collagen; its cyclic structure leads to kinks in the peptide chain of proteins.

Similar
Pro
OriginEnglish pyrrolidine ← German Pyrro ← Ancient Greek πῠρρός (pŭrrhós) →
Less commonScrabble 9
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Meanings

nounproline (countable and uncountable, plural prolines)

plural prolines

  1. countableuncountablebiochemistryA nonessential amino acid C₅H₉NO₂ found in most animal proteins, especially collagen; its cyclic structure leads to kinks in the peptide chain of proteins.

    Synonyms: Pro

Synonyms & antonyms

nounA nonessential amino acid C₅H₉NO₂ found in most animal proteins, especially collagen; its cyclic structure leads to kinks in the peptide chain of proteins.

Similar
Pro

Origin

  1. Proto-Indo-European*péh₂wr̥
  2. Proto-Hellenic*pāwər
  3. Ancient Greekπῦρ (pûr)
  4. Ancient Greekπῠρρός (pŭrrhós)
  5. GermanPyrro
  6. Englishpyrrole
  7. Englishpyrrolidine
  8. Englishproline

Short for pyrrolidine.

Full word history & related roots →

Translations

Bulgarian пролин
  • пролин (prolin)nonessential amino acid; C5H9NO2
Catalan prolina
  • prolinanonessential amino acid; C5H9NO2
Chinese Mandarin 脯氨酸
  • 脯氨酸 (fǔ'ānsuān)nonessential amino acid; C5H9NO2
Czech prolin
  • prolinnonessential amino acid; C5H9NO2
Esperanto prolino
  • prolinononessential amino acid; C5H9NO2
Finnish proliini
  • proliininonessential amino acid; C5H9NO2
French proline
  • prolinenonessential amino acid; C5H9NO2
German Prolin
  • Prolinnonessential amino acid; C5H9NO2
Greek προλίνη
  • προλίνη (prolíni)nonessential amino acid; C5H9NO2
Hungarian prolin
  • prolinnonessential amino acid; C5H9NO2
Italian prolina
  • prolinanonessential amino acid; C5H9NO2
Japanese プロリン
  • プロリン (purorin)nonessential amino acid; C5H9NO2
Polish prolina
  • prolinanonessential amino acid; C5H9NO2
Romanian prolină
  • prolinănonessential amino acid; C5H9NO2
Russian пролин
  • пролин (prolin)nonessential amino acid; C5H9NO2
Slovak prolín
  • prolínnonessential amino acid; C5H9NO2
Spanish prolina
  • prolinanonessential amino acid; C5H9NO2
Swedish prolin
  • prolinnonessential amino acid; C5H9NO2

Rhymes & wordplay

Anagrams

plerion
Cite this entry
APA

proline. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/proline

MLA

“proline.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/proline. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “proline,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/proline.

Source: proline on Wiktionary, CC BY-SA 4.0.