A substance, usually an antibody, that prevents or counteracts the clumping effects of agglutinin (a substance that causes clumping).
From anti- (against) + agglutinin (from Latin agglutinare, to glue). The -in suffix typically denotes a protein or chemical substance. This immunological term developed in the early 20th century during advances in serological testing.
This is literally nature's anti-glue—when agglutinins try to stick cells together, antiagglutinins jump in to stop it, creating a molecular game of tug-of-war in your blood!
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