Meaning of IGM in English

-ˈem noun

Etymology: I mmuno g lobulin M

1. : a class of immunoglobulins of high molecular weight including the primary antibodies released into the blood early in the immune response to be replaced later by IgG of lower molecular weight and that are highly efficient in binding complement

2. : an immunoglobulin of the class IgM

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.