definition of a peptide
A compound consisting of two or more amino acids linked in a chain, the carboxyl group of each acid being joined to the amino group of the next by a bond of the type ïOCïNHï. Example sentences. 1  Among the amino acids of the peptide, the most dramatic change was the Phe residue.2  If there are only two amino acids then the peptide is a dipeptide. 3  The peptide contains complementary amino acid sequences, with alternating positive and negative charges.xample sentences. 1  Among the amino acids of the peptide, the most dramatic change was the Phe residue. 2  If there are only two amino acids then the peptide is a dipeptide. 3  The peptide contains complementary amino acid sequences, with alternating positive and negative charges.