IG

antibody, any of several blood proteins which identify and disable infectious foreign bodies; part of the blood serum that contains antibodies (Immunology)

IG, Ig, or ig may mean: Places:Ig, a town and a municipality in SloveniaIG postal area, a group of 11 postal districts in north east Greater LondonTerms:Inspector General (civilian or military administration), a high ranking official charged with the mission to inspect and report on some bodies in his field of competencyImmunoglobulin (Ig)Igbo language, the official language of Nigeria (ISO 639 alpha-2, ig)Insulated GlassCompanies:IG, the IATA code for Meridiana airlineIG Farben, a German industrial conglomerateIG Group, a UK speculative investment companyiG - internet Generation, a Brazilian internet service providerProduction I.G., a famous Japanese anime company
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Ig immunoglobulin of any of the five classes: IgA, IgD, IgE, IgG, and IgM. Ig abbr. immunoglobulin. Immunoglobulin Antibody such as IgM; large [more]Ig - Community and Resources

Noun
1. a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response
(synonym) immunoglobulin, immune serum globulin, immune gamma globulin, immune globulin
(hypernym) gamma globulin, human gamma globulin
(hyponym) immunoglobulin A, IgA

Tu, trade union, association of craftsmen