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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
polyvalent is an adjective meaning "containing several antibodies each capable of counteracting a specific antigen". It carries 2 recorded senses.
containing several antibodies each capable of counteracting a specific antigen
“a polyvalent vaccine”
immunology
having more than one valence, or having a valence of 3 or higher
chemistry
Definitions, synonyms and semantic relations for polyvalent come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.