Definition of oxygen

Definition of oxygen
  1. oxygen Noun A chemical element ("symbol" O) with an atomic number of 8 and relative atomic mass of 15.9994.
  2. oxygen Noun Molecular oxygen (O2), a colorless, odorless gas at room temperature.
  3. oxygen Noun A mixture of oxygen and other gases, administered to a patient to help him or her to breathe.
  4. oxygen Noun An atom of this element.
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