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In immunochemistry, pertaining to a protein from a single clone of cells, all molecules of which are the same; e.g., in the case of Bence Jones protein, the chains are all κ or λ.
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mono·clo·nal .män-ə-'klōn-əl adj produced by, being, or composed of cells derived from a single cell <a \monoclonal tumor> esp relating to or being an antibody derived from a single cell in large quantities for use against a specific antigen (as a cancer cell)
monoclonal n a monoclonal antibody
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mono·clo·nal (mon″o-kloґnəl) derived from or pertaining to a single clone.Medical dictionary. 2011.