oligopeptide
noun
oli·go·pep·tide
| \ ˌäl-i-gō-ˈpep-ˌtīd
, ˌō-li-
\
, ˌō-li-
\
Medical Definition of oligopeptide
: a protein fragment or molecule that usually consists of less than 25 amino acid residues linked in a polypeptide chain