Definition of alanine in English:


Syllabification: al·a·nine
Pronunciation: /ˈaləˌnēn


  • An amino acid that is a constituent of most proteins.
    • Alternative name: 2-aminopropanoic acid; chemical formula: CH3CH(NH2)COOH. β-alanine, an isomer of this, is 3-aminopropanoic acid, (NH2)CH2CH2COOH
    More example sentences
    • Other examples of amino acids are alanine, leucine, cysteine, arginine, and tryptophan.
    • All of these silks are composed of protein chains in which the amino acids glycine, alanine, and serine dominate.
    • Also, a combination of the amino acids glycine, alanine and glutamic acid can relieve symptoms of prostatitis.


mid 19th century: coined in German as Alanin, from aldehyde + -an (for ease of pronunciation) + -ine4.

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