Part of speech: noun

A gaseous element, necessary to combustion and to animal life, existing in both the air and water.

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Usage examples "oxygen":

  1. How's the oxygen supply, and- and everything? - "The Air Trust", George Allan England.
  2. Oxygen is necessary for life. - "An Introduction to Chemical Science", R.P. Williams.
  3. And Danny knew that that air, of which eighty percent was nitrogen, was being rid of its oxygen in the retort at his back, and the nitrogen alone was pouring out beneath him in a tremendous and ceaseless blast. - "The Hammer of Thor", Charles Willard Diffin.