IgA Definition in the Cambridge English Dictionary
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Definition of “IgA” - English Dictionary

Definition of "IgA" - British English Dictionary

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IgAnoun [U]

specialized
abbreviation for Immunoglobulin A (IgA): an antibody (= a ​substance in the ​blood that ​attacksharmfulbacteria) that is very ​important in ​protecting the ​body in mucusmembranes (= the ​thickskin that ​covers the inside of ​bodyparts such as the ​nose and ​mouth)
(Definition of IgA from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)