Anoxia

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 (medicine), 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

• Anoxia (beetle), a genus of scarab beetles
• Oxygen saturation, a relative measure of the oxygen dissolved or carried in a medium; a measure of the severity of hypoxic conditions
• Oxygen toxicity (hyperoxia), the opposite condition of hypoxia, an excess of oxygen in body tissues
• Oxygen-free (disambiguation)