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superoxide

[soo-per-ok-sahyd, -sid] /ˌsu pərˈɒk saɪd, -sɪd/
noun, Chemistry
1.
a compound containing the univalent ion O 2 .
2.
peroxide (def 1a, b).
Also called hyperoxide.
Origin of superoxide
1840-1850
1840-50; super- + oxide
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for superoxide

superoxide

/ˌsuːpərˈɒksaɪd/
noun
1.
any of certain metal oxides that contain the O2 ion: potassium superoxide, KO2
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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superoxide in Medicine

superoxide su·per·ox·ide (sōō'pər-ŏk'sīd')
n.
A compound containing a univalent anionic oxygen molecule or the univalent anion itself.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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