Macroglobulinemia means: Macroglobulinemia is a condition where the blood has high amounts of large proteins. The blood can become thicker or more viscous if it has too many large proteins. This could cause blood to become thicker and less able to pass through tiny blood vessels. A macroglobulin, or IgM is an antibody that contains large amounts of protein. Waldenstrom’s macroglobulinemia (a form of cancer) is one type of macroglobulinemia.
(in Medical Dictionary)

What else does Macroglobulinemia mean?

An abnormally high level of macroglobulins found in blood serum.
(in Merlin Dictionary)