noun Chemistry.
an oxide containing five atoms of oxygen, as phosphorus pentoxide, P 2 O 5 .

1860–65; pent- + oxide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pentoxide (pɛntˈɒksaɪd)
an oxide of an element with five atoms of oxygen per molecule

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The previous operations which involved the extraction of vanadium pentoxide have ceased.
Desiccants generally used include: anhydrous calcium sulfate, silica gel, or phosphorus pentoxide.
It takes fire spontaneously in air, burning to the pentoxide.
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