adjective (a)

• containing several antibodies each capable of counteracting a specific antigen(adj.all)

  Example:
  A polyvalent vaccine.
  

  Antonym:
  monovalent
  

  source: wordnet30
• having more than one valence, or having a valence of 3 or higher(adj.all)

  Synonym:
  multivalent
  Antonym:
  monovalent, univalent
  

  source: wordnet30
• Multivalent.(adjective)

  source: webster1913