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Related to pentoxide: vanadium pentoxide, Nitrogen pentoxide, Arsenic pentoxide, Diphosphorus pentoxide
A compound having five atoms of oxygen combined with another element.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) an oxide of an element with five atoms of oxygen per molecule
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an oxide containing five atoms of oxygen, as phosphorus pentoxide, P2O5.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.