1
: having a chemical valence greater usually than two
2
: effective against, sensitive toward, or counteracting more than one toxin, microorganism, or antigen
polyvalent vaccines

Word History

Etymology

International Scientific Vocabulary

First Known Use

1866, in the meaning defined at sense 1

Time Traveler
The first known use of polyvalent was in 1866

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Cite this Entry

“Polyvalent.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/polyvalent. Accessed 8 Jul. 2026.

Medical Definition

polyvalent

adjective
1
a
: having a chemical valence greater usually than two
b
: having variable valence
2
: effective against, sensitive toward, or counteracting more than one exciting agent (as a toxin or antigen)
a polyvalent vaccine
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