The definition of immunoglobulin is a protein that fights against disease.
An example of an immunoglobulin is a protein that fights against strep throat.
a globulin protein that participates in the immune reaction as the antibody for a specific antigen
Any of a group of large glycoproteins that are secreted by plasma cells and that function as antibodies in the immune response by binding with specific antigens. There are five classes of immunoglobulins: IgA, IgD, IgE, IgG, and IgM.
From immuno- + globulin.