In dictionaries:
Hexavalent chromium
(chromium(VI), Cr(VI), chromium 6) any chemical compound that contains the element chromium in the +6 oxidation state (thus hexavalent).
Hexavalent vaccine
A hexavalent vaccine, or 6-in-1 vaccine, is a combination vaccine with six individual vaccines conjugated into one, intended to protect people from multiple diseases.
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