dioxide

[dahy-ok-sahyd, -sid]
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:
1840–50; di-1 + oxide

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World English Dictionary
dioxide (daɪˈɒksaɪd)
 
n
1.  any oxide containing two oxygen atoms per molecule, both of which are bonded to an atom of another element
2.  another name for a peroxide

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

dioxide di·ox·ide (dī-ŏk'sīd)
n.
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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American Heritage
Science Dictionary
dioxide   (dī-ŏk'sīd)  Pronunciation Key 
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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Example sentences
When this elemental sulfur is burned in the air, it forms sulfur dioxide.
The outer layer of silicon dioxide protects the active layers inside.
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