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Wordnet 3.0

NOUN (1)

1. one of the five major classes of immunoglobulins; involved in fighting blood infections and in triggering production of immunoglobulin G;
[syn: immunoglobulin M, IgM]



WordNet (r) 3.0 (2006):

IgM
    n 1: one of the five major classes of immunoglobulins; involved
         in fighting blood infections and in triggering production
         of immunoglobulin G [syn: immunoglobulin M, IgM]