Definition of “IgA” - English Dictionary

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“IgA” in British English

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IgAnoun [ U ]

specialized

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 thick skin that covers the inside of body parts such as the nose and mouth)

(Definition of “IgA” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)