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[dahy-ok-sahyd, -sid] /daɪˈɒk saɪd, -sɪd/
noun, Chemistry
an oxide containing two atoms of oxygen, each of which is bonded directly to an atom of a second element, as manganese dioxide, MnO 2 , or nitrogen dioxide, NO 2 .
Origin of dioxide
1840-50; di-1 + oxide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for dioxide
  • When this elemental sulfur is burned in the air, it forms sulfur dioxide.
  • The outer layer of silicon dioxide protects the active layers inside.
British Dictionary definitions for dioxide


any oxide containing two oxygen atoms per molecule, both of which are bonded to an atom of another element
another name for a peroxide (sense 4)
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
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dioxide in Medicine

dioxide di·ox·ide (dī-ŏk'sīd)
A compound containing two oxygen atoms per molecule.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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dioxide in Science
A compound containing two oxygen atoms per molecule.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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