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The term anoxia means a total depletion in the level of oxygen, an extreme form of hypoxia or "low oxygen". The terms anoxia and hypoxia are used in various contexts:

  • Anoxic waters, sea water, fresh water or groundwater that are depleted of dissolved oxygen
  • Anoxic event, when the Earth's oceans become completely depleted of oxygen below the surface levels
  • Euxinic, anoxic conditions in the presence of hydrogen sulfide
  • Hypoxia (environmental), low oxygen conditions
  • Hypoxia (medical), when the body or a region of the body is deprived of adequate oxygen supply
    • Cerebral anoxia, when the brain is completely deprived of oxygen, an extreme form of cerebral hypoxia

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