proline

noun

pro·​line ˈprō-ˌlēn 

: an amino acid C₅H₉NO₂ that can be synthesized by animals from glutamate

Examples of proline in a Sentence

Recent Examples on the Web

And Susie points to recent research that highlights how bone broth contains amino acids like glutamine, glycine, proline, histidine and arginine, which can collectively be helpful with immune function, tissue repair and muscle recovery. — Daryl Austin, USA Today, 6 June 2026

Your body breaks it down into amino acids, primarily glycine, proline, and hydroxyproline. — Jillian Kubala, Health, 4 June 2026

One specific variant changes a single amino acid at position seven of the receptor protein, from proline to leucine. — William A. Haseltine, Forbes.com, 17 Apr. 2026

The amino acids required for collagen synthesis, particularly glycine, proline, and lysine, are readily available from a wide range of foods including eggs, fish, poultry, dairy products, legumes, soy foods and meat. — Leeann Weintraub, Daily News, 5 Feb. 2026

Oysters contain an inordinate amount of zinc and copper, and the amino acids proline and lysine, precursors of collagen. — Alessandra Signorelli, Vogue, 1 July 2025

Word History

Etymology

German Prolin, contraction of Pyrrolidin pyrrolidine (C₄H₉N), from International Scientific Vocabulary pyrrole + -idine

First Known Use

1904, in the meaning defined above

Rhymes for proline

• affine
• airline
• align
• aline
• assign
• baseline
• beamline
• benign
• bloodline
• bovine
• brucine
• byline

Medical Definition

proline

noun

pro·​line ˈprō-ˌlēn 

: an amino acid C₅H₉NO₂ that can be synthesized by animals from glutamate

—abbreviation Pro