A protein substance, such as an antibody, that is capable of causing agglutination (clumping) of a particular antigen.
Antibodies that function with homologous antigens to form lumping or agglutination.
A factor in a serum which makes cells stick together in clumps.
Antibodies demonstrated by their ability to agglutinate their corresponding antigen. Where the antigen is a suspension of motile organisms, the agglutinin immobilizes the bacteria prior to their aggregation.
Substance in an antibody that causes clumping of a specific antigen (e.g., the Rh factor).
An antibody that brings about the agglutination of bacteria, blood cells, or other antigenic particles.
An antibody present in the blood that attaches to an antigen present on cells or solid particles, causing them to agglutinate or clump together; used primarily in reference to laboratory tests of agglutination. Agglutinins cause transfusion reactions when blood from a different group is given. These antibodies are present at birth and require no exposure to an antigen to be created, since they are genetically determined.