pentavalent

[pen-tuh-vey-luhnt, pen-tav-uh-]
adjective Chemistry.
1.
having a valence of 5: pentavalent arsenic.
2.
quinquevalent ( def 2 ).

Origin:
1870–75; penta- + -valent

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World English Dictionary
pentavalent (ˌpɛntəˈveɪlənt)
 
adj
chem Also: quinquevalent having a valency of five

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Plus, pentavalent arsenic is much easier to reduce than pentavalent phosphorus, resulting in oxidative damage.
Effects of pentavalent inorganic arsenic are partially due to its transformation to trivalent arsenic.
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