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

1870–75; penta- + -valent Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pentavalent (ˌpɛntəˈveɪlənt)
chem Also: quinquevalent having a valency of five

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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