Agglutination is the clumping of particles. The word agglutination comes from the Latin agglutinare (glueing to). Agglutination is the process that occurs if an antigen is mixed with its corresponding antibody called isoagglutinin. This term is commonly used in blood grouping.

noun the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated synonyms: agglutinating activity see more noun a clumping of bacteria or red cells when held together by antibodies (agglutinins) see more noun