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pentoxide

[pen-tok-sahyd]
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noun Chemistry.
  1. an oxide containing five atoms of oxygen, as phosphorus pentoxide, P2O5.
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Origin of pentoxide

1860–65; pent- + oxide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for pentoxide

pentoxide

noun
  1. an oxide of an element with five atoms of oxygen per molecule
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012