[soo-per-ok-sahyd, -sid]
noun Chemistry.
a compound containing the univalent ion O 2 .
peroxide ( def 1a, b ).
Also called hyperoxide.

1840–50; super- + oxide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superoxide (ˌsuːpərˈɒksaɪd)
any of certain metal oxides that contain the O2-- ion: potassium superoxide, KO2

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

superoxide su·per·ox·ide (sōō'pər-ŏk'sīd')
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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Example sentences
There is a second reaction that involves superoxide, a negatively charged oxygen molecule.
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