pol·y·va·lent 
(pŏl′ē-vālənt)
(pŏl′ē-vālənt)adj.
1. Chemistry
a. Having more than one valence.
b. Having a valence of 3 or higher.
2. Immunology
a. Having more than one site of attachment. Used of an antibody or antigen.
b. Containing antigens from more than one strain of a microorganism or virus. Used of a vaccine or serum.
pol′y·valence, pol′y·valen·cy n.