1. Having the combining power (valence) of a hydrogen atom. SYN: monatomic (2), univalent. 2. Pertaining to a m. (specific) antiserum to a single antigen or organism.
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mono·va·lent .män-ə-'vā-lənt adj
1) having a chemical valence of one
2) containing antibodies specific for or antigens of a single strain of a microorganism <a \monovalent vaccine>
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mono·va·lent (mon″o-vaґlənt) 1. having a valence of one. Called also univalent. 2. denoting an antiserum, vaccine, or antitoxin specific for a single antigen or organism.Medical dictionary. 2011.