GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Multivalent (?), a. [Multi- + L. valens, p. pr. See Valence.]
   1. (Chem.) (a) Having a valence greater than one, as silicon. (b) Having more than one degree of valence, as sulphur.
   
   [1913 Webster]
   
   
   2. (Immunology) Having multiple antigen-binding sites; -- of antibody molecules.
   
   [PJC]
   
   
   3. (Immunology) Containing several types of antibody, to protect against more than one disease; polyvalent; -- of vaccines.
   
   [PJC]