| multivalent | <chemistry> Having a valence greater than one, as silicon. Having more than one degree of valence, as sulphur. Origin: Multi- + L. Valens, p. Pr. See Valence. Source: Websters Dictionary (01 Mar 1998) |
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| multivalent vaccine | A vaccine prepared from cultures of two or more strains of the same species or microorganism. Synonym: multivalent vaccine. (05 Mar 2000) |