Definition of "monoclonal"

monoclonal

/ˌmɒn.əˈkləʊ.nəl/

adjective
not comparable
1. (biochemistry) genetically engineered from a single clone; used especially of a protein or antibody
  Quotations
  One of the first examples of the immunogenicity of recombinantly derived antibodies was with murine anti-CD3 monoclonal antibody (OKT3) used in the induction of immunosupression after organ transplantation.
  2002, Gilbert S. Banker, Christopher T. Rhodes, Modern Pharmaceutics, 4th edition, Informa Health Care, page 699
noun
plural monoclonals
1. (immunochemistry) something produced from a single clone, especially a monoclonal antibody