1. An antibody that causes clumping or agglutination of the bacteria or other cells which either stimulated the formation of the agglutinin, or contain immunologically similar, reactive antigen. Syn: agglutinating antibody, immune agglutinin.
2. A substance, other than a specific agglutinating antibody, that causes organic particles to agglutinate, commonly qualified, e.g., plant agglutinin.
blood group agglutinins
chief agglutinin
cold agglutinin
cross-reacting agglutinin
flagellar agglutinin
group agglutinin
H agglutinin
immune agglutinin
incomplete agglutinin
major agglutinin
minor agglutinin
O agglutinin
partial agglutinin
plant agglutinin
saline agglutinin
serum agglutinin
somatic agglutinin
warm agglutinins