'agglutination' definitions:

Definition of 'agglutination'

(from WordNet)
noun
A clumping of bacteria or red cells when held together by antibodies (agglutinins)
noun
The building of words from component morphemes that retain their form and meaning in the process of combining
noun
The coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated [syn: agglutination, agglutinating activity]