monoclonal gammopathy
noun
plural monoclonal gammopathies
: any of various disorders marked by proliferation of a single, abnormal clone of a plasma cell or B cell especially in the bone marrow resulting in an abnormal increase of monoclonal antibody in the blood serum and urine and that include both benign or asymptomatic conditions and neoplastic conditions (such as multiple myeloma)
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Merriam-Webster unabridged
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