PROTEINS

n. essential organic compound composed of 20 or more amino acids joined by peptide bonds

Proteins are large organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid residues. The sequence of amino acids in a protein is defined by a gene and encoded in the genetic code. Although this genetic code specifies 20 "standard" amino acids, the residues in a protein are often chemically altered in post-translational modification: either before the protein can function in the cell, or as part of control mechanisms. Proteins can also work together to achieve a particular function, and they often associate to form stable complexes.
See more at Wikipedia.org...

Proteins, n.pl macromolecules made of up of amino acids joined by peptide linkages and that provide essential life functions. [more]Proteins - Community and Resources

Noun
1. any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes; "a diet high in protein"
(hypernym) macromolecule, supermolecule
(hyponym) capsid
(substance-holonym) meat
(substance-meronym) amino acid, aminoalkanoic acid

n. protein, essential organic compound composed of 20 or more amino acids joined by peptide bonds