Definitions:

1. Agglutination of red blood cells. NOUN
   • The haemagglutination assay confirmed the presence of the influenza virus in the patient's sample.
2. Refers to the process in which red blood cells clump together or aggregate, when certain substances, such as antibodies, viruses, or other proteins, bind to antigens on the surface of red blood cells, causing them to stick together. NOUN
   • The haemagglutination reaction observed under the microscope indicated the presense of antibodies against the pathogen.
3. The agglutination of red blood cells, especially as a test for the presence of antibodies. NOUN
   • In certain autoimmune disorders, haemagglutination occurs due to the production of autoantibodies targeting red blood cells.

Synonyms:

• agglutination
• aggregation
• clumping
• coagulation
• hemagglutination