Definition of amino acid in English:

amino acid


  • A simple organic compound containing both a carboxyl (—COOH) and an amino (—NH₂) group.

    as modifier ‘the amino-acid sequence of a protein’
    • ‘Homocysteine is produced from the amino acid methionine, which is found in normal dietary protein.’
    • ‘To tackle this problem a variety of approaches have been developed to predict the three-dimensional structure of a protein given its amino-acid sequence.’
    • ‘The simplest amino acid is glycine which contains a hydrogen atom as its side group.’
    • ‘Protein molecules are large biological polymers of small molecules called amino acids, and each protein has a unique amino-acid sequence.’
    • ‘Two known enzymes catabolize the essential amino acid tryptophan in mammals.’

Amino acids occur naturally in plant and animal tissues and form the basic constituents of proteins. There are about twenty common amino acids, of which the simplest is glycine (H₂NCH₂COOH)


amino acid

/əˌmiːnəʊ ˈasɪd/