macroglobulin

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mac·ro·glob·u·lin

 (măk′rō-glŏb′yə-lĭn)
n.
A plasma globulin of high molecular weight.

macroglobulin

(ˌmækrəʊˈɡlɒbjʊlɪn)
n
1. (Biochemistry) an immunoglobulin of unusually high relative molecular mass, observed in the blood in some diseases
2. (Biochemistry) Also called: immunoglobulin M the normal form of this immunoglobulin