oxygen

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

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.