immunoglobulin noun. [,ɪmjʊnǝʊ'glɒbjʊlɪn, ɪ,mju:nǝʊ-] M20.
[from IMMUNO- + GLOBULIN.]
Biochemistry & Medicine. Any of a group of proteins present in vertebrates in the serum and cells of the immune system, which have a characteristic arrangement of subunits in their molecular structure, and function as antibodies.

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