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dioxide

[dahy-ok-sahyd, -sid]
noun Chemistry.
  1. an oxide containing two atoms of oxygen, each of which is bonded directly to an atom of a second element, as manganese dioxide, MnO2, or nitrogen dioxide, NO2.
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Origin of dioxide

First recorded in 1840–50; di-1 + oxide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for dioxide

dioxide

noun
  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 (def. 4)
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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

dioxide in Medicine

dioxide

(dī-ŏksīd)
n.
  1. A compound containing two oxygen atoms per molecule.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

dioxide in Science

dioxide

[dī-ŏksīd]
  1. A compound containing two oxygen atoms per molecule.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.