A peptide is a compound that comtains two or more amino acids that is formed by the breaking down of proteins or by being linked together in a defined order. (noun)
An example of a peptide is a simple protein in a lab.
See peptide in Webster's New World College Dictionary
noun
any of a group of compounds formed from two or more amino acids by the linkage of amino groups of some of the acids with carboxyl groups of others, or by the hydrolysis of proteins
See peptide in American Heritage Dictionary 4
(pĕpˈtīdˌ)
noun
Any of various natural or synthetic compounds containing two or more amino acids linked by the carboxyl group of one amino acid to the amino group of another.