A substance or antibody that opposes or inhibits precipitin, a protein that causes reactions in immunology.
From anti- + precipitin (a protein in blood serum). Precipitin comes from Latin praecipitare, 'to throw headlong.' This is a technical immunology term used in medical and scientific research.
Antiprecipitin is basically the immune system's opposing player—if precipitin makes something happen, antiprecipitin stops it, like a biological game of tug-of-war!
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