arginine

noun

ar·​gi·​nine ˈär-jə-ˌnēn 

: a crystalline basic amino acid C₆H₁₄N₄O₂ derived from guanidine

Examples of arginine in a Sentence

Recent Examples on the Web

Pumpkin Seeds Pumpkin seeds support heart health thanks to arginine, an amino acid that helps maintain healthy blood vessels. —Abby Norman, Verywell Health, 21 Apr. 2026

These arginine-tyrosine interactions remain active as the fiber solidifies. —Mrigakshi Dixit, Interesting Engineering, 6 Feb. 2026

These forms differ at two positions in the protein, called 112 and 158, where the building blocks cysteine or arginine can appear in different combinations. —William A. Haseltine, Forbes.com, 27 Jan. 2026

Its formula of ceramides, astaxanthin, and arginine strengthen, provide elasticity, and heal weak or broken hair. —Olivia Dubyak, InStyle, 14 Jan. 2026

Word History

Etymology

German Arginin

First Known Use

1886, in the meaning defined above

Rhymes for arginine

• acridine
• alkaline
• andesine
• anodyne
• anticline
• asinine
• atropine
• benzidine
• borderline
• byzantine
• calamine
• caroline

Kids Definition

arginine

noun

ar·​gi·​nine ˈär-jə-ˌnēn 

: an amino acid that is found in various proteins

Medical Definition

arginine

noun

ar·​gi·​nine ˈär-jə-ˌnēn 

: a crystalline basic amino acid C₆H₁₄N₄O₂ derived from guanidine

—abbreviation Arg