superoxide

noun
su·​per·​ox·​ide | \ ˌsü-pər-ˈäk-ˌsīd How to pronounce superoxide (audio) \

Definition of superoxide

: the monovalent anion O2 or a compound containing it potassium superoxide KO2

First Known Use of superoxide

1807, in the meaning defined above

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The first known use of superoxide was in 1807

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superoxide

noun
su·​per·​ox·​ide | \ -ˈäk-ˌsīd How to pronounce superoxide (audio) \

Medical Definition of superoxide

: any of various toxic oxygen-containing free radicals especially : the monovalent anion O2 or a compound containing it potassium superoxide KO2

More from Merriam-Webster on superoxide

Britannica.com: Encyclopedia article about superoxide

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