pentoxide

[pen-tok-sahyd]
noun Chemistry.
an oxide containing five atoms of oxygen, as phosphorus pentoxide, P 2 O 5 .

Origin:
1860–65; pent- + oxide

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World English Dictionary
pentoxide (pɛntˈɒksaɪd)
 
n
an oxide of an element with five atoms of oxygen per molecule

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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