| Noun | 1. | immunoglobulin - a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response gamma globulin, human gamma globulin - a plasma protein containing the immunoglobulins that are responsible for immune responses antibody - any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response IgA, immunoglobulin A - one of the most common of the five major classes of immunoglobulins; the chief antibody in the membranes of the gastrointestinal and respiratory tracts IgD, immunoglobulin D - one of the five major classes of immunoglobulins; present in blood serum in small amounts IgE, immunoglobulin E - one of the five major classes of immunoglobulins; present primarily in the skin and mucous membranes IgG, immunoglobulin G - one of the five major classes of immunoglobulins; the main antibody defense against bacteria IgM, immunoglobulin M - one of the five major classes of immunoglobulins; involved in fighting blood infections and in triggering production of immunoglobulin G tetanus immune globulin, tetanus immunoglobulin - sterile solution of globulins derived from the blood plasma of a person who has been immunized for tetanus; provides short-term immunization against tetanus in cases of possible exposure to the tetanus bacillus |