adjective Chemistry.
having a valence of six.

1885–90; hexa- + -valent

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World English Dictionary
hexavalent (ˌhɛksəˈveɪlənt)
chem Also: sexivalent having a valency of six

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Dry hexavalent chromium flakes are occasionally added to tanks, which can generate airborne particulates of hexavalent chromium.
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