Chem. a colourless tasteless odourless gaseous element,occurring naturally in air, water, and most minerals and organicsubstances, and essential to plant and animal life. °Symb.: O.
Oxygen mask a mask placed over the nose and mouth to supplyoxygen for breathing. oxygen tent a tentlike enclosuresupplying a patient with air rich in oxygen.
Oxygenous adj.[F oxygŠne acidifying principle (as OXY- 2): it was at firstheld to be the essential principle in the formation of acids]
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