oxygen
- Noun. A chemical element (''symbol'' O) with an atomic number of 8 and relative atomic mass of 15.9994.
- Noun. Molecular oxygen (O2), a colorless, odorless gas at room temperature.
- Noun. (medicine) A mixture of oxygen and other gases, administered to a patient to help him or her to breathe.
- Noun. (countable) An atom of this element..
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This entry was last updated on RefTopia from its source on 3/20/2012.