immunoglobulin Eimmunoglobulin E
- The class of antibodies that bind to mast cells and basophils and trigger them to release histamines and other substances that are responsible for allergic reactions. Immunoglobulin E antibodies are also thought to defend against parasitic worms.
- An antibody of this class.
- (immunology) A class of antibody (immunoglobulin "isotype") found in mammals.