IgA

Abbreviation for immunoglobulin A, a major class of immunoglobulins found in serum and external body secretions such as saliva, tears, and sweat as well as in the gastrointestinal, respiratory, and genitourinary tracts.

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Abbreviation for immunoglobulin A.

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immunoglobulin A

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IgA .ī-.jē-'ā n

1) a class of immunoglobulins that include antibodies found in external bodily secretions (as saliva, tears, and sweat)

2) an immunoglobulin of the class IgA

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immunoglobulin A; see immunoglobulin.