monoclonal antibody

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

• noun Any of the highly specific antibodies produced in large quantity by the clones of a single hybridoma cell.

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

• noun medicine A protein genetically engineered from a single clone of a B cell, especially one produced by fusion with a tumor cell and intended for use as a drug.

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

• noun any of a class of antibodies produced in the laboratory by a single clone of cells or a cell line and consisting of identical antibody molecules