Noun immunoglobulin a has 1 sense
  1. immunoglobulin A, IgA - one of the most common of the five major classes of immunoglobulins; the chief antibody in the membranes of the gastrointestinal and respiratory tracts
    --1 is a kind of immunoglobulin, Ig, immune serum globulin, immune gamma globulin, immune globulin
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