• Absence of oxygen.
  • A pathological deficiency of oxygen, especially hypoxia.
  • a physiological state in which insufficient oxygen reaches the tissues of the body, especially when of sufficient severity to cause permanent damage.
  • A condition in which a tissue or environment is severely or totally deprived of <xref>oxygen</xref>, severe <xref>hypoxia</xref>.
  • severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues
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