Definitions:

1. Refers to the process in which red blood cells clump together or aggregate, usually as a result of a reaction with certain agents such as viruses, bacteria, antibodies, or lectins. VERB
   • The influenza virus was shown to haemagglutinate red blood cells in the laboratory assay.
2. Term often used in medical fields, especially microbiology and immunology, and a process crucial for the detection and identification of certain types of diseases. VERB
   • Blood type determination relies on the ability of specific antibodies to haemagglutinate red blood cells.

Synonyms:

• agglutinate
• aggregate
• clump
• coagulate
• hemagglutinate