Antonyms for Univalent (opposite meaning)
WordNet sense 1 (used of the association of three or more homologous chromosomes during the first division of meiosis):
multivalentWordNet sense 2 (used of homologous chromosomes associated in pairs in synapsis):
bivalentWordNet sense 3 (having more than one valence, or having a valence of 3 or higher):
polyvalentFrom the ODE community, based on WordNetadd/edit