• enPR: ŏk'sĭjən, IPA: /ˈɒksɪdʒən/


  1. The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas.
    Hypernyms: chalcogen
  2. Molecular oxygen (O2), a colorless, odorless gas at room temperature, also called dioxygen.
  3. (medicine) A mixture of oxygen and other gases, administered to a patient to help them breathe.
  4. (countable) An atom of this element.
    • 2013, Spencer L. Seager, ‎Michael R. Slabaugh, Chemistry for Today: General, Organic, and Biochemistry (page 479)
      Look first at any structure to see if there is a carbon with two oxygens attached. Hemiacetals, hemiketals, acetals, and ketals are all alike in that regard.
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