剑桥词典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 ) 免疫球蛋白A（Immunoglobulin A的縮寫） 返回 IgA