<immunology> Major class of immunoglobulin of external secretions in mammals, also found in serum and body fluids such as tears and saliva and in the respiratory, reproductive, urinary and gastrointestinal tracts. ... Immunoglobulin A protects the bodys mucosal surfaces from infection and in secretions, it is found as a dimer (400 kD) joined ...
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http://www.encyclo.co.uk/local/20973
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. Abbreviated IgA.
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http://www.medterms.com/script/main/art.asp?articlekey=21066
[
n] - one of the most common of the five major classes of immunoglobulins
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http://www.webdictionary.co.uk/definition.php?query=immunoglobulin%20A
(IgA) A class of immunoglobulin that is the second most common immunoglobulin in blood. It is the main immunoglobulin found in secretions, such as tears, saliva, colostrum, mucous membranes of the intestine, respiratory and reproductive tracts. IgA provides local defense against microorganisms as they try to infect mucous membranes.
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https://www.cdc.gov/parasites/glossary.html
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