n. the presence in the blood of excessive amounts of *macroglobulin (IgM), produced by a malignant proliferation of the lymphocytes in certain *lymphomas. See Waldenstrom’s macroglobulinaemia.
(lymphoplasmacytic lymphoma) a type of low-grade relatively slow-growing non-Hodgkin’s *lymphoma characterized by enlarged lymph nodes and high levels of abnormal IgM (*macroglobulin) in the blood (see macroglobulinaemia). [J. G. Waldenstrom (1906–96), Swedish physician]... waldenstrom’s macroglobulinaemia
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