pen·ta·va·lent

[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) [Click for IPA pronunciation guide]
 
adj
chem Also: quinquevalent having a valency of five

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Pentavalent is always a great word to know.
So is flibbertigibbet. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a chattering or flighty, light-headed person.
Example sentences
Effects of pentavalent inorganic arsenic are partially due to its transformation to trivalent arsenic.
Plus, pentavalent arsenic is much easier to reduce than pentavalent phosphorus, resulting in oxidative damage.
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