peptide bond

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The chemical bond between carboxyl groups and amino groups of neighboring amino acids, forming an amide group and constituting the primary linkage of all protein structures.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry An amide bond formed between the amino and carboxyl functional groups of separate amino acids
• noun biochemistry The primary linkage of amino acids in proteins

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the primary linkage of all protein structures; the chemical bond between the carboxyl groups and amino groups that unites a peptide