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English definition of “IgA”

IgA

noun [U] // us  // specialized
written abbreviation for Immunoglobulin A (IgA): an antibody (= a substance in the blood that attacks harmful bacteria) that is very important in protecting the body in mucus membranes ( =the think skin that covers the inside of body parts such as the nose and mouth and produces mucus to protect them)The circulatory system and blood
(Definition of IgA from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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