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1. the action of an agglutinant substance.
2. the clumping together in suspension of antigen-bearing cells, microorganisms, or particles in the presence of specific antibodies (agglutinins).
3. the process of union of the surfaces of a wound. adj., adj agglutina´tive.
cross agglutination the agglutination of particulate antigen by an antibody raised against a different but related antigen; see also group agglutination.
group agglutination agglutination, usually to a lower titer, of various members of a group of biologically related organisms by an agglutinin specific for one of that group. For instance, the specific agglutinin of typhoid bacilli may agglutinate other members of the colon-typhoid group, such as Escherichia coli and Salmonella enteritidis.
intravascular agglutination clumping of particulate elements within the blood vessels; used conventionally to denote red blood cell agglutination.
platelet agglutination the clumping together of platelets owing to the action of platelet agglutinins; such agglutinins are important in platelet typing.
agglutination test any test based on an agglutination reaction, as serologic tests for specific antibodies.
agglutination by antibodies specific for minor (group) antigens common to several microorganisms, each of which possesses its own major specific antigen.
Synonym(s): cross agglutination
group ag·glu·ti·na·tion(grūp ă-glū'ti-nā'shŭn)
Agglutination by antibodies specific for minor (group) antigens common to several microorganisms, each of which possesses its own major specific antigen.