Etymology
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polyvalent (adj.)

"capable of combining partly with one element, partly with another," 1881, from poly- + -valent (see valence in the chemistry sense). Coined by German chemist Emil Erlenmeyer, who also designed the flask that bears his name.

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Definitions of polyvalent

polyvalent (adj.)
containing several antibodies each capable of counteracting a specific antigen;
a polyvalent vaccine
polyvalent (adj.)
having more than one valence, or having a valence of 3 or higher;
Synonyms: multivalent
From wordnet.princeton.edu