(Science: cell biology, haematology) The clumping together of cells due to the binding of agglutinin (a protein) molecules on the surface of each cell. The clumping together of two organisms of the same species for the purpose of sexual reproduction. Often conducted by means of acarbohydrate on one organism and a protein on theother, resulting in a glycoprotein. A clumping of bacteria or red cells when held together by antibodies (agglutinins).The building of words from component morphemes that retain their form and meaning in the process of combining.The coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated.Agglutination is an allergic reaction type occurrence where cells become more compact together to prevent foreign materials entering them. This is usually the result of an antigen in the vicinity of the cells.