Hence it can be stated technically that an agglutinin possesses a haptophore group and an agglutinating group.
If agglutinin is present and the test is giving a positive reaction, the bacilli will be collected in large clumps.
agglutinin ag·glu·ti·nin (ə-glōōt'n-ĭn)
A substance, such as an antibody, that is capable of causing agglutination of a particular antigen, especially red blood cells or bacteria.
A substance, other than a specific agglutinating antibody, that causes organic particles to agglutinate.