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Noun superoxide has 2 senses
  1. superoxide - a metallic oxide containing the univalent anion O2-
    --1 is a kind of     oxide
  2. superoxide, superoxide anion - the univalent anion O2-; "much of the O2 supporting cellular respiration is reduced to the superoxide anion O2-"
    --2 is a kind of anion
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