aggulutination is the clumping of particles
This occurs in Biology in three main examples:
- The clumping of cells such as bacteria or red blood cells in the presence of an antibody. The antibody or other molecule binds multiple particles and joins them, creating a large complex.
- The coalescing of small particles that are suspended in a solution; these larger masses are then (usually) precipitated.
- An allergic reaction type occurrence where cells become more compacted together to prevent foreign materials entering them. This is usually the result of an antigen in the vicinity of the cells.