What is "peptoid"

n. (context organic chemistry English) Any of a class of peptide analogues, many of which are peptidomimetic, that have alkyl side chains attached to some of the nitrogen atoms of glycine residues

Peptoids, or poly-N-substituted glycines, are a class of peptidomimetics whose side chains are appended to the nitrogen atom of the peptide backbone, rather than to the α-carbons (as they are in amino acids).