WIKTIONARY

amino acid

Noun

∙ Any organic compound containing both an amino and a carboxylic acid functional group. organic chemistry
∙ Any of the twenty naturally occurring α-amino acids (having the amino, and carboxylic acid groups on the same carbon atom), and a variety of side chains, that combine, via peptide bonds, to form proteins. biochemistry

BABYLON ENGLISH
amino acid n.
organic compound from which proteins are made
amino acids
group of organic compounds, basic constituents of proteins

WORDNET 2.0
amino acid
Noun
1. organic compounds containing an amino group and a carboxylic acid group; "proteins are composed of various proportions of about 20 common amino acids"
(synonym) aminoalkanoic acid
(hypernym) organic compound
(hyponym) alanine
(substance-holonym) protein

ENGLISH WIKIPEDIA - THE FREE ENCYCLOPEDIA
Amino acid
Amino acids are biologically important organic compounds containing amine (-NH2) and carboxylic acid (-COOH) functional groups, usually along with a side-chain specific to each amino acid. The key elements of an amino acid are carbon, hydrogen, oxygen, and nitrogen, though other elements are found in the side-chains of certain amino acids. About 500 amino acids are known and can be classified in many ways. They can be classified according to the core structural functional groups' locations as alpha- (α-), beta- (β-), gamma- (γ-) or delta- (δ-) amino acids; other categories relate to polarity, pH level, and side-chain group type (aliphatic, acyclic, aromatic, containing hydroxyl or sulfur, etc.). In the form of proteins, amino acids comprise the second-largest component (water is the largest) of human muscles, cells and other tissues. Outside proteins, amino acids perform critical roles in processes such as neurotransmitter transport and biosynthesis.
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